diff --git a/src/problem4/solution.ts b/src/problem4/solution.ts
new file mode 100644
index 000000000..2ba3d9ace
--- /dev/null
+++ b/src/problem4/solution.ts
@@ -0,0 +1,67 @@
+// Problem 4: Three ways to sum to n (TypeScript)
+// ================================================
+
+/**
+ * Method 1: Iterative approach using a for loop
+ * 
+ * Time Complexity: O(n) - loops n times
+ * Space Complexity: O(1) - only uses a single variable for sum
+ * 
+ * Efficiency: Simple and straightforward, but slower for large n
+ * Use case: Good for small to medium values of n, easy to understand
+ */
+function sum_to_n_a(n: number): number {
+  let sum = 0;
+  for (let i = 1; i <= n; i++) {
+    sum += i;
+  }
+  return sum;
+}
+
+/**
+ * Method 2: Mathematical formula (Gauss formula)
+ * Formula: n * (n + 1) / 2
+ * 
+ * Time Complexity: O(1) - constant time, single calculation
+ * Space Complexity: O(1) - no additional space needed
+ * 
+ * Efficiency: Most efficient approach, instant calculation regardless of n
+ * Use case: Best for any size of n, especially large values
+ * Note: This is the optimal solution
+ */
+function sum_to_n_b(n: number): number {
+  return (n * (n + 1)) / 2;
+}
+
+/**
+ * Method 3: Recursive approach
+ * 
+ * Time Complexity: O(n) - makes n recursive calls
+ * Space Complexity: O(n) - call stack grows to n depth
+ * 
+ * Efficiency: Least efficient due to function call overhead and stack usage
+ * Use case: Demonstrates recursion concept but not recommended for large n
+ * Warning: May cause stack overflow for very large values of n
+ */
+function sum_to_n_c(n: number): number {
+  if (n <= 1) {
+    return n;
+  }
+  return n + sum_to_n_c(n - 1);
+}
+
+// Test cases
+console.log('Testing sum_to_n_a:');
+console.log(`sum_to_n_a(5) = ${sum_to_n_a(5)}`); // Expected: 15
+console.log(`sum_to_n_a(10) = ${sum_to_n_a(10)}`); // Expected: 55
+console.log(`sum_to_n_a(100) = ${sum_to_n_a(100)}`); // Expected: 5050
+
+console.log('\nTesting sum_to_n_b:');
+console.log(`sum_to_n_b(5) = ${sum_to_n_b(5)}`); // Expected: 15
+console.log(`sum_to_n_b(10) = ${sum_to_n_b(10)}`); // Expected: 55
+console.log(`sum_to_n_b(100) = ${sum_to_n_b(100)}`); // Expected: 5050
+
+console.log('\nTesting sum_to_n_c:');
+console.log(`sum_to_n_c(5) = ${sum_to_n_c(5)}`); // Expected: 15
+console.log(`sum_to_n_c(10) = ${sum_to_n_c(10)}`); // Expected: 55
+console.log(`sum_to_n_c(100) = ${sum_to_n_c(100)}`); // Expected: 5050
diff --git a/src/problem4/tsconfig.json b/src/problem4/tsconfig.json
new file mode 100644
index 000000000..c8c45f91f
--- /dev/null
+++ b/src/problem4/tsconfig.json
@@ -0,0 +1,17 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "commonjs",
+    "lib": ["ES2020"],
+    "moduleResolution": "node",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "outDir": "./dist",
+    "types": ["node"]
+  },
+  "include": ["*.ts"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/src/problem5/.env.example b/src/problem5/.env.example
new file mode 100644
index 000000000..766252b48
--- /dev/null
+++ b/src/problem5/.env.example
@@ -0,0 +1,2 @@
+PORT=3000
+NODE_ENV=development
diff --git a/src/problem5/.gitignore b/src/problem5/.gitignore
new file mode 100644
index 000000000..8ca37287e
--- /dev/null
+++ b/src/problem5/.gitignore
@@ -0,0 +1,7 @@
+node_modules
+dist
+.env
+*.log
+.DS_Store
+data/*.json
+!data/.gitkeep
diff --git a/src/problem5/README.md b/src/problem5/README.md
new file mode 100644
index 000000000..8ac7c13be
--- /dev/null
+++ b/src/problem5/README.md
@@ -0,0 +1,373 @@
+# Problem 5: A Crude Server
+
+A RESTful CRUD API server built with Express.js and TypeScript, featuring a simple file-based database for data persistence.
+
+## Features
+
+- ✅ **CRUD Operations**: Create, Read, Update, Delete resources
+- 🔍 **Filtering**: List resources with type, status, and search filters
+- 💾 **Data Persistence**: JSON file-based database
+- 🔒 **TypeScript**: Fully typed for better development experience
+- 🚀 **Express.js**: Fast and minimal web framework
+- 🔄 **Hot Reload**: Development mode with automatic restart
+- 📚 **Swagger Documentation**: Interactive API documentation with Swagger UI
+
+## Tech Stack
+
+- **Runtime**: Node.js
+- **Framework**: Express.js
+- **Language**: TypeScript
+- **Database**: JSON file-based storage
+- **Documentation**: Swagger/OpenAPI 3.0 with Swagger UI
+
+## Installation
+
+1. Install dependencies:
+```bash
+npm install
+```
+
+2. Create environment file:
+```bash
+cp .env.example .env
+```
+
+3. (Optional) Modify `.env` to change port:
+```env
+PORT=3000
+NODE_ENV=development
+```
+
+## Running the Application
+
+### Development Mode (with hot reload)
+```bash
+npm run dev
+```
+
+### Production Mode
+```bash
+# Build TypeScript to JavaScript
+npm run build
+
+# Start the server
+npm start
+```
+
+The server will start at `http://localhost:3000`
+
+## API Documentation
+
+### Swagger UI
+Once the server is running, access the interactive API documentation at:
+
+**Swagger UI**: [http://localhost:3000/api-docs](http://localhost:3000/api-docs)
+
+The Swagger documentation provides:
+- 📖 Complete API reference with all endpoints
+- 🧪 Interactive testing interface - try API calls directly from the browser
+- 📋 Request/response schemas with example values
+- ✅ Validation rules and required fields
+- 🎯 Query parameters and filters documentation
+
+## API Endpoints
+
+### Base URL
+```
+http://localhost:3000
+```
+
+### 1. List All Resources
+```http
+GET /api/resources
+```
+
+**Query Parameters** (optional):
+- `type` - Filter by resource type
+- `status` - Filter by status (active/inactive)
+- `search` - Search in name and description
+
+**Example:**
+```bash
+curl http://localhost:3000/api/resources
+curl http://localhost:3000/api/resources?type=server&status=active
+curl http://localhost:3000/api/resources?search=test
+```
+
+**Response:**
+```json
+{
+  "success": true,
+  "count": 2,
+  "data": [
+    {
+      "id": "resource_1234567890_abc123",
+      "name": "Test Resource",
+      "description": "A test resource",
+      "type": "server",
+      "status": "active",
+      "createdAt": "2026-01-25T10:00:00.000Z",
+      "updatedAt": "2026-01-25T10:00:00.000Z",
+      "metadata": {}
+    }
+  ]
+}
+```
+
+### 2. Get Resource by ID
+```http
+GET /api/resources/:id
+```
+
+**Example:**
+```bash
+curl http://localhost:3000/api/resources/resource_1234567890_abc123
+```
+
+**Response:**
+```json
+{
+  "success": true,
+  "data": {
+    "id": "resource_1234567890_abc123",
+    "name": "Test Resource",
+    "description": "A test resource",
+    "type": "server",
+    "status": "active",
+    "createdAt": "2026-01-25T10:00:00.000Z",
+    "updatedAt": "2026-01-25T10:00:00.000Z",
+    "metadata": {}
+  }
+}
+```
+
+### 3. Create a Resource
+```http
+POST /api/resources
+Content-Type: application/json
+```
+
+**Required Fields:**
+- `name` (string)
+- `description` (string)
+- `type` (string)
+
+**Optional Fields:**
+- `status` ("active" | "inactive") - defaults to "active"
+- `metadata` (object)
+
+**Example:**
+```bash
+curl -X POST http://localhost:3000/api/resources \
+  -H "Content-Type: application/json" \
+  -d '{
+    "name": "New Server",
+    "description": "Production server instance",
+    "type": "server",
+    "status": "active",
+    "metadata": {
+      "cpu": "4 cores",
+      "ram": "16GB"
+    }
+  }'
+```
+
+**Response:**
+```json
+{
+  "success": true,
+  "message": "Resource created successfully",
+  "data": {
+    "id": "resource_1234567890_abc123",
+    "name": "New Server",
+    "description": "Production server instance",
+    "type": "server",
+    "status": "active",
+    "createdAt": "2026-01-25T10:00:00.000Z",
+    "updatedAt": "2026-01-25T10:00:00.000Z",
+    "metadata": {
+      "cpu": "4 cores",
+      "ram": "16GB"
+    }
+  }
+}
+```
+
+### 4. Update a Resource
+```http
+PUT /api/resources/:id
+Content-Type: application/json
+```
+
+**All fields are optional:**
+- `name` (string)
+- `description` (string)
+- `type` (string)
+- `status` ("active" | "inactive")
+- `metadata` (object)
+
+**Example:**
+```bash
+curl -X PUT http://localhost:3000/api/resources/resource_1234567890_abc123 \
+  -H "Content-Type: application/json" \
+  -d '{
+    "status": "inactive",
+    "metadata": {
+      "cpu": "8 cores",
+      "ram": "32GB"
+    }
+  }'
+```
+
+**Response:**
+```json
+{
+  "success": true,
+  "message": "Resource updated successfully",
+  "data": {
+    "id": "resource_1234567890_abc123",
+    "name": "New Server",
+    "description": "Production server instance",
+    "type": "server",
+    "status": "inactive",
+    "createdAt": "2026-01-25T10:00:00.000Z",
+    "updatedAt": "2026-01-25T10:30:00.000Z",
+    "metadata": {
+      "cpu": "8 cores",
+      "ram": "32GB"
+    }
+  }
+}
+```
+
+### 5. Delete a Resource
+```http
+DELETE /api/resources/:id
+```
+
+**Example:**
+```bash
+curl -X DELETE http://localhost:3000/api/resources/resource_1234567890_abc123
+```
+
+**Response:**
+```json
+{
+  "success": true,
+  "message": "Resource deleted successfully"
+}
+```
+
+## Error Responses
+
+### 400 Bad Request
+```json
+{
+  "success": false,
+  "message": "Missing required fields: name, description, type"
+}
+```
+
+### 404 Not Found
+```json
+{
+  "success": false,
+  "message": "Resource with ID 'xyz' not found"
+}
+```
+
+### 500 Internal Server Error
+```json
+{
+  "success": false,
+  "message": "Internal server error",
+  "error": "Error details (development mode only)"
+}
+```
+
+## Project Structure
+
+```
+src/problem5/
+├── src/
+│   ├── config/
+│   │   └── swagger.ts         # Swagger/OpenAPI configuration
+│   ├── types/
+│   │   └── resource.ts        # TypeScript interfaces
+│   ├── database/
+│   │   └── db.ts              # File-based database operations
+│   ├── routes/
+│   │   └── resources.ts       # CRUD route handlers with Swagger annotation
+│   │   └── resources.ts       # CRUD route handlers
+│   └── middleware/
+│       └── errorHandler.ts    # Error handling middleware
+├── data/
+│   └── resources.json         # JSON database file (auto-created)
+├── dist/                      # Compiled JavaScript (after build)
+├── package.json
+├── tsconfig.json
+├── .env.example
+└── README.md
+```
+
+## Database
+
+The application uses a simple JSON file-based database stored in `data/resources.json`. The file is automatically created on first run.
+
+**Data Structure:**
+```json
+[
+  {
+    "id": "resource_1234567890_abc123",
+    "name": "Resource Name",
+    "description": "Resource Description",
+    "type": "resource-type",
+    "status": "active",
+    "createdAt": "2026-01-25T10:00:00.000Z",
+    "updatedAt": "2026-01-25T10:00:00.000Z",
+    "metadata": {}
+  }
+]
+```
+
+## Testing with cURL
+
+### Create a few test resources:
+```bash
+# Create resource 1
+curl -X POST http://localhost:3000/api/resources \
+  -H "Content-Type: application/json" \
+  -d '{"name":"Web Server","description":"Main production server","type":"server","status":"active"}'
+
+# Create resource 2
+curl -X POST http://localhost:3000/api/resources \
+  -H "Content-Type: application/json" \
+  -d '{"name":"Database","description":"PostgreSQL instance","type":"database","status":"active"}'
+
+# List all resources
+curl http://localhost:3000/api/resources
+
+# Filter by type
+curl http://localhost:3000/api/resources?type=server
+
+# Search
+curl http://localhost:3000/api/resources?search=database
+```
+
+## Development
+
+The server uses `ts-node-dev` for development, which provides:
+- Automatic TypeScript compilation
+- Hot reload on file changes
+- Fast restart times
+
+## Notes
+
+- The database is stored in a JSON file for simplicity
+- For production use, consider using a proper database (PostgreSQL, MongoDB, etc.)
+- The server includes basic error handling and validation
+- CORS is enabled for cross-origin requests
+
+## License
+
+ISC
diff --git a/src/problem5/package-lock.json b/src/problem5/package-lock.json
new file mode 100644
index 000000000..4f2f6363a
--- /dev/null
+++ b/src/problem5/package-lock.json
@@ -0,0 +1,2035 @@
+{
+  "name": "crude-server",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "crude-server",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "cors": "^2.8.5",
+        "dotenv": "^16.3.1",
+        "express": "^4.18.2",
+        "swagger-jsdoc": "^6.2.8",
+        "swagger-ui-express": "^5.0.0"
+      },
+      "devDependencies": {
+        "@types/cors": "^2.8.17",
+        "@types/express": "^4.17.21",
+        "@types/node": "^20.10.5",
+        "@types/swagger-jsdoc": "^6.0.4",
+        "@types/swagger-ui-express": "^4.1.6",
+        "ts-node": "^10.9.2",
+        "ts-node-dev": "^2.0.0",
+        "typescript": "^5.3.3"
+      }
+    },
+    "node_modules/@apidevtools/json-schema-ref-parser": {
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+      }
+    },
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+      "peerDependencies": {
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+    "node_modules/@cspotcode/source-map-support": {
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+      "license": "MIT",
+      "dependencies": {
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+      "engines": {
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+      }
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+      "dev": true,
+      "license": "MIT"
+    },
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+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
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+      "license": "MIT",
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+      }
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+    "node_modules/utils-merge": {
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+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
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+        "node": ">= 0.4.0"
+      }
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+      "license": "MIT"
+    },
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+      "resolved": "https://registry.npmjs.org/validator/-/validator-13.15.26.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
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+      "license": "ISC"
+    },
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+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.4"
+      }
+    },
+    "node_modules/yaml": {
+      "version": "2.0.0-1",
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+      "license": "ISC",
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/z-schema": {
+      "version": "5.0.5",
+      "resolved": "https://registry.npmjs.org/z-schema/-/z-schema-5.0.5.tgz",
+      "integrity": "sha512-D7eujBWkLa3p2sIpJA0d1pr7es+a7m0vFAnZLlCEKq/Ij2k0MLi9Br2UPxoxdYystm5K1yeBGzub0FlYUEWj2Q==",
+      "license": "MIT",
+      "dependencies": {
+        "lodash.get": "^4.4.2",
+        "lodash.isequal": "^4.5.0",
+        "validator": "^13.7.0"
+      },
+      "bin": {
+        "z-schema": "bin/z-schema"
+      },
+      "engines": {
+        "node": ">=8.0.0"
+      },
+      "optionalDependencies": {
+        "commander": "^9.4.1"
+      }
+    },
+    "node_modules/z-schema/node_modules/commander": {
+      "version": "9.5.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-9.5.0.tgz",
+      "integrity": "sha512-KRs7WVDKg86PWiuAqhDrAQnTXZKraVcCc6vFdL14qrZ/DcWwuRo7VoiYXalXO7S5GKpqYiVEwCbgFDfxNHKJBQ==",
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": "^12.20.0 || >=14"
+      }
+    }
+  }
+}
diff --git a/src/problem5/package.json b/src/problem5/package.json
new file mode 100644
index 000000000..12eb1eb5c
--- /dev/null
+++ b/src/problem5/package.json
@@ -0,0 +1,32 @@
+{
+  "name": "crude-server",
+  "version": "1.0.0",
+  "description": "A CRUD backend server with ExpressJS and TypeScript",
+  "main": "dist/server.js",
+  "scripts": {
+    "dev": "ts-node-dev --respawn --transpile-only src/server.ts",
+    "build": "tsc",
+    "start": "node dist/server.js",
+    "test": "echo \"No tests specified\""
+  },
+  "keywords": ["express", "typescript", "crud", "api"],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.18.2",
+    "cors": "^2.8.5",
+    "dotenv": "^16.3.1",
+    "swagger-ui-express": "^5.0.0",
+    "swagger-jsdoc": "^6.2.8"
+  },
+  "devDependencies": {
+    "@types/express": "^4.17.21",
+    "@types/cors": "^2.8.17",
+    "@types/node": "^20.10.5",
+    "@types/swagger-ui-express": "^4.1.6",
+    "@types/swagger-jsdoc": "^6.0.4",
+    "typescript": "^5.3.3",
+    "ts-node": "^10.9.2",
+    "ts-node-dev": "^2.0.0"
+  }
+}
diff --git a/src/problem5/src/config/swagger.ts b/src/problem5/src/config/swagger.ts
new file mode 100644
index 000000000..28a614f59
--- /dev/null
+++ b/src/problem5/src/config/swagger.ts
@@ -0,0 +1,188 @@
+import swaggerJsdoc from 'swagger-jsdoc';
+
+const options: swaggerJsdoc.Options = {
+  definition: {
+    openapi: '3.0.0',
+    info: {
+      title: 'CRUD API Server',
+      version: '1.0.0',
+      description: 'A RESTful CRUD API server built with Express.js and TypeScript',
+      contact: {
+        name: 'API Support',
+      },
+    },
+    servers: [
+      {
+        url: 'http://localhost:3000',
+        description: 'Development server',
+      },
+    ],
+    tags: [
+      {
+        name: 'Resources',
+        description: 'Resource management endpoints',
+      },
+    ],
+    components: {
+      schemas: {
+        Resource: {
+          type: 'object',
+          required: ['id', 'name', 'description', 'type', 'status', 'createdAt', 'updatedAt'],
+          properties: {
+            id: {
+              type: 'string',
+              description: 'Unique resource identifier',
+              example: 'resource_1234567890_abc123',
+            },
+            name: {
+              type: 'string',
+              description: 'Resource name',
+              example: 'Web Server',
+            },
+            description: {
+              type: 'string',
+              description: 'Resource description',
+              example: 'Main production web server',
+            },
+            type: {
+              type: 'string',
+              description: 'Resource type',
+              example: 'server',
+            },
+            status: {
+              type: 'string',
+              enum: ['active', 'inactive'],
+              description: 'Resource status',
+              example: 'active',
+            },
+            createdAt: {
+              type: 'string',
+              format: 'date-time',
+              description: 'Creation timestamp',
+            },
+            updatedAt: {
+              type: 'string',
+              format: 'date-time',
+              description: 'Last update timestamp',
+            },
+            metadata: {
+              type: 'object',
+              description: 'Additional resource metadata',
+              additionalProperties: true,
+            },
+          },
+        },
+        CreateResourceDTO: {
+          type: 'object',
+          required: ['name', 'description', 'type'],
+          properties: {
+            name: {
+              type: 'string',
+              description: 'Resource name',
+              example: 'New Server',
+            },
+            description: {
+              type: 'string',
+              description: 'Resource description',
+              example: 'Production server instance',
+            },
+            type: {
+              type: 'string',
+              description: 'Resource type',
+              example: 'server',
+            },
+            status: {
+              type: 'string',
+              enum: ['active', 'inactive'],
+              description: 'Resource status (optional, defaults to active)',
+              example: 'active',
+            },
+            metadata: {
+              type: 'object',
+              description: 'Additional metadata (optional)',
+              additionalProperties: true,
+            },
+          },
+        },
+        UpdateResourceDTO: {
+          type: 'object',
+          properties: {
+            name: {
+              type: 'string',
+              description: 'Resource name',
+            },
+            description: {
+              type: 'string',
+              description: 'Resource description',
+            },
+            type: {
+              type: 'string',
+              description: 'Resource type',
+            },
+            status: {
+              type: 'string',
+              enum: ['active', 'inactive'],
+              description: 'Resource status',
+            },
+            metadata: {
+              type: 'object',
+              description: 'Additional metadata',
+              additionalProperties: true,
+            },
+          },
+        },
+        SuccessResponse: {
+          type: 'object',
+          properties: {
+            success: {
+              type: 'boolean',
+              example: true,
+            },
+            data: {
+              $ref: '#/components/schemas/Resource',
+            },
+          },
+        },
+        ListResponse: {
+          type: 'object',
+          properties: {
+            success: {
+              type: 'boolean',
+              example: true,
+            },
+            count: {
+              type: 'number',
+              example: 10,
+            },
+            data: {
+              type: 'array',
+              items: {
+                $ref: '#/components/schemas/Resource',
+              },
+            },
+          },
+        },
+        ErrorResponse: {
+          type: 'object',
+          properties: {
+            success: {
+              type: 'boolean',
+              example: false,
+            },
+            message: {
+              type: 'string',
+              example: 'Error message',
+            },
+            error: {
+              type: 'string',
+              example: 'Detailed error information',
+            },
+          },
+        },
+      },
+    },
+  },
+  apis: ['./src/routes/*.ts'],
+};
+
+export const swaggerSpec = swaggerJsdoc(options);
diff --git a/src/problem5/src/database/db.ts b/src/problem5/src/database/db.ts
new file mode 100644
index 000000000..aa59f0d09
--- /dev/null
+++ b/src/problem5/src/database/db.ts
@@ -0,0 +1,127 @@
+import fs from 'fs';
+import path from 'path';
+import { Resource, CreateResourceDTO, UpdateResourceDTO, ResourceFilter } from '../types/resource';
+
+const DATA_FILE = path.join(__dirname, '../../data/resources.json');
+
+// Ensure data directory and file exist
+const ensureDataFile = () => {
+  const dataDir = path.dirname(DATA_FILE);
+  if (!fs.existsSync(dataDir)) {
+    fs.mkdirSync(dataDir, { recursive: true });
+  }
+  if (!fs.existsSync(DATA_FILE)) {
+    fs.writeFileSync(DATA_FILE, JSON.stringify([], null, 2));
+  }
+};
+
+// Read resources from file
+const readResources = (): Resource[] => {
+  ensureDataFile();
+  const data = fs.readFileSync(DATA_FILE, 'utf-8');
+  return JSON.parse(data);
+};
+
+// Write resources to file
+const writeResources = (resources: Resource[]): void => {
+  ensureDataFile();
+  fs.writeFileSync(DATA_FILE, JSON.stringify(resources, null, 2));
+};
+
+// Generate unique ID
+const generateId = (): string => {
+  return `resource_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
+};
+
+class Database {
+  // Get all resources with optional filters
+  getAllResources(filters?: ResourceFilter): Resource[] {
+    let resources = readResources();
+
+    if (filters) {
+      if (filters.type) {
+        resources = resources.filter(r => r.type === filters.type);
+      }
+      if (filters.status) {
+        resources = resources.filter(r => r.status === filters.status);
+      }
+      if (filters.search) {
+        const searchLower = filters.search.toLowerCase();
+        resources = resources.filter(r =>
+          r.name.toLowerCase().includes(searchLower) ||
+          r.description.toLowerCase().includes(searchLower)
+        );
+      }
+    }
+
+    return resources;
+  }
+
+  // Get resource by ID
+  getResourceById(id: string): Resource | null {
+    const resources = readResources();
+    return resources.find(r => r.id === id) || null;
+  }
+
+  // Create new resource
+  createResource(data: CreateResourceDTO): Resource {
+    const resources = readResources();
+    
+    const newResource: Resource = {
+      id: generateId(),
+      name: data.name,
+      description: data.description,
+      type: data.type,
+      status: data.status || 'active',
+      createdAt: new Date().toISOString(),
+      updatedAt: new Date().toISOString(),
+      metadata: data.metadata || {}
+    };
+
+    resources.push(newResource);
+    writeResources(resources);
+
+    return newResource;
+  }
+
+  // Update resource
+  updateResource(id: string, data: UpdateResourceDTO): Resource | null {
+    const resources = readResources();
+    const index = resources.findIndex(r => r.id === id);
+
+    if (index === -1) {
+      return null;
+    }
+
+    const updatedResource: Resource = {
+      ...resources[index],
+      ...data,
+      updatedAt: new Date().toISOString()
+    };
+
+    resources[index] = updatedResource;
+    writeResources(resources);
+
+    return updatedResource;
+  }
+
+  // Delete resource
+  deleteResource(id: string): boolean {
+    const resources = readResources();
+    const filteredResources = resources.filter(r => r.id !== id);
+
+    if (filteredResources.length === resources.length) {
+      return false; // Resource not found
+    }
+
+    writeResources(filteredResources);
+    return true;
+  }
+
+  // Check if resource exists
+  resourceExists(id: string): boolean {
+    return this.getResourceById(id) !== null;
+  }
+}
+
+export default new Database();
diff --git a/src/problem5/src/middleware/errorHandler.ts b/src/problem5/src/middleware/errorHandler.ts
new file mode 100644
index 000000000..bc0f0d609
--- /dev/null
+++ b/src/problem5/src/middleware/errorHandler.ts
@@ -0,0 +1,16 @@
+import { Request, Response, NextFunction } from 'express';
+
+export const errorHandler = (
+  err: Error,
+  req: Request,
+  res: Response,
+  next: NextFunction
+) => {
+  console.error('Error:', err);
+
+  res.status(500).json({
+    success: false,
+    message: 'Internal server error',
+    error: process.env.NODE_ENV === 'development' ? err.message : undefined
+  });
+};
diff --git a/src/problem5/src/routes/resources.ts b/src/problem5/src/routes/resources.ts
new file mode 100644
index 000000000..87a263127
--- /dev/null
+++ b/src/problem5/src/routes/resources.ts
@@ -0,0 +1,347 @@
+import { Router, Request, Response } from 'express';
+import db from '../database/db';
+import { CreateResourceDTO, UpdateResourceDTO, ResourceFilter } from '../types/resource';
+
+const router = Router();
+
+/**
+ * @swagger
+ * /api/resources:
+ *   get:
+ *     summary: List all resources
+ *     description: Retrieve a list of all resources with optional filtering
+ *     tags: [Resources]
+ *     parameters:
+ *       - in: query
+ *         name: type
+ *         schema:
+ *           type: string
+ *         description: Filter by resource type
+ *       - in: query
+ *         name: status
+ *         schema:
+ *           type: string
+ *           enum: [active, inactive]
+ *         description: Filter by status
+ *       - in: query
+ *         name: search
+ *         schema:
+ *           type: string
+ *         description: Search in name and description
+ *     responses:
+ *       200:
+ *         description: List of resources
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ListResponse'
+ *       500:
+ *         description: Server error
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ */
+router.get('/', (req: Request, res: Response) => {
+  try {
+    const filters: ResourceFilter = {
+      type: req.query.type as string,
+      status: req.query.status as 'active' | 'inactive',
+      search: req.query.search as string
+    };
+
+    const resources = db.getAllResources(filters);
+
+    res.json({
+      success: true,
+      count: resources.length,
+      data: resources
+    });
+  } catch (error) {
+    res.status(500).json({
+      success: false,
+      message: 'Failed to retrieve resources',
+      error: error instanceof Error ? error.message : 'Unknown error'
+    });
+  }
+});
+
+/**
+ * @swagger
+ * /api/resources/{id}:
+ *   get:
+ *     summary: Get a resource by ID
+ *     description: Retrieve details of a specific resource
+ *     tags: [Resources]
+ *     parameters:
+ *       - in: path
+ *         name: id
+ *         required: true
+ *         schema:
+ *           type: string
+ *         description: Resource ID
+ *     responses:
+ *       200:
+ *         description: Resource details
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/SuccessResponse'
+ *       404:
+ *         description: Resource not found
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ *       500:
+ *         description: Server error
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ */
+router.get('/:id', (req: Request, res: Response) => {
+  try {
+    const { id } = req.params;
+    const resource = db.getResourceById(id);
+
+    if (!resource) {
+      return res.status(404).json({
+        success: false,
+        message: `Resource with ID '${id}' not found`
+      });
+    }
+
+    res.json({
+      success: true,
+      data: resource
+    });
+  } catch (error) {
+    res.status(500).json({
+      success: false,
+      message: 'Failed to retrieve resource',
+      error: error instanceof Error ? error.message : 'Unknown error'
+    });
+  }
+});
+
+/**
+ * @swagger
+ * /api/resources:
+ *   post:
+ *     summary: Create a new resource
+ *     description: Add a new resource to the database
+ *     tags: [Resources]
+ *     requestBody:
+ *       required: true
+ *       content:
+ *         application/json:
+ *           schema:
+ *             $ref: '#/components/schemas/CreateResourceDTO'
+ *     responses:
+ *       201:
+ *         description: Resource created successfully
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 success:
+ *                   type: boolean
+ *                   example: true
+ *                 message:
+ *                   type: string
+ *                   example: Resource created successfully
+ *                 data:
+ *                   $ref: '#/components/schemas/Resource'
+ *       400:
+ *         description: Bad request - missing required fields
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ *       500:
+ *         description: Server error
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ */
+router.post('/', (req: Request, res: Response) => {
+  try {
+    const { name, description, type, status, metadata }: CreateResourceDTO = req.body;
+
+    // Validation
+    if (!name || !description || !type) {
+      return res.status(400).json({
+        success: false,
+        message: 'Missing required fields: name, description, and type are required'
+      });
+    }
+
+    const newResource = db.createResource({
+      name,
+      description,
+      type,
+      status,
+      metadata
+    });
+
+    res.status(201).json({
+      success: true,
+      message: 'Resource created successfully',
+      data: newResource
+    });
+  } catch (error) {
+    res.status(500).json({
+      success: false,
+      message: 'Failed to create resource',
+      error: error instanceof Error ? error.message : 'Unknown error'
+    });
+  }
+});
+
+/**
+ * @swagger
+ * /api/resources/{id}:
+ *   put:
+ *     summary: Update a resource
+ *     description: Update an existing resource by ID
+ *     tags: [Resources]
+ *     parameters:
+ *       - in: path
+ *         name: id
+ *         required: true
+ *         schema:
+ *           type: string
+ *         description: Resource ID
+ *     requestBody:
+ *       required: true
+ *       content:
+ *         application/json:
+ *           schema:
+ *             $ref: '#/components/schemas/UpdateResourceDTO'
+ *     responses:
+ *       200:
+ *         description: Resource updated successfully
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 success:
+ *                   type: boolean
+ *                   example: true
+ *                 message:
+ *                   type: string
+ *                   example: Resource updated successfully
+ *                 data:
+ *                   $ref: '#/components/schemas/Resource'
+ *       404:
+ *         description: Resource not found
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ *       500:
+ *         description: Server error
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ */
+router.put('/:id', (req: Request, res: Response) => {
+  try {
+    const { id } = req.params;
+    const updates: UpdateResourceDTO = req.body;
+
+    const updatedResource = db.updateResource(id, updates);
+
+    if (!updatedResource) {
+      return res.status(404).json({
+        success: false,
+        message: `Resource with ID '${id}' not found`
+      });
+    }
+
+    res.json({
+      success: true,
+      message: 'Resource updated successfully',
+      data: updatedResource
+    });
+  } catch (error) {
+    res.status(500).json({
+      success: false,
+      message: 'Failed to update resource',
+      error: error instanceof Error ? error.message : 'Unknown error'
+    });
+  }
+});
+
+/**
+ * @swagger
+ * /api/resources/{id}:
+ *   delete:
+ *     summary: Delete a resource
+ *     description: Remove a resource from the database
+ *     tags: [Resources]
+ *     parameters:
+ *       - in: path
+ *         name: id
+ *         required: true
+ *         schema:
+ *           type: string
+ *         description: Resource ID
+ *     responses:
+ *       200:
+ *         description: Resource deleted successfully
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 success:
+ *                   type: boolean
+ *                   example: true
+ *                 message:
+ *                   type: string
+ *                   example: Resource deleted successfully
+ *       404:
+ *         description: Resource not found
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ *       500:
+ *         description: Server error
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ */
+router.delete('/:id', (req: Request, res: Response) => {
+  try {
+    const { id } = req.params;
+    const success = db.deleteResource(id);
+
+    if (!success) {
+      return res.status(404).json({
+        success: false,
+        message: `Resource with ID '${id}' not found`
+      });
+    }
+
+    res.json({
+      success: true,
+      message: 'Resource deleted successfully'
+    });
+  } catch (error) {
+    res.status(500).json({
+      success: false,
+      message: 'Failed to delete resource',
+      error: error instanceof Error ? error.message : 'Unknown error'
+    });
+  }
+});
+
+export default router;
diff --git a/src/problem5/src/server.ts b/src/problem5/src/server.ts
new file mode 100644
index 000000000..01f60fb42
--- /dev/null
+++ b/src/problem5/src/server.ts
@@ -0,0 +1,52 @@
+import express, { Application } from 'express';
+import cors from 'cors';
+import dotenv from 'dotenv';
+import swaggerUi from 'swagger-ui-express';
+import { swaggerSpec } from './config/swagger';
+import resourceRoutes from './routes/resources';
+import { errorHandler } from './middleware/errorHandler';
+
+dotenv.config();
+
+const app: Application = express();
+const PORT = process.env.PORT || 3000;
+
+// Middleware
+app.use(cors());
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
+
+// Swagger Documentation
+app.use('/api-docs', swaggerUi.serve, swaggerUi.setup(swaggerSpec, {
+  customCss: '.swagger-ui .topbar { display: none }',
+  customSiteTitle: 'CRUD API Documentation',
+}));
+
+// Routes
+app.get('/', (req, res) => {
+  res.json({
+    message: 'Welcome to CRUD API Server',
+    version: '1.0.0',
+    documentation: `http://localhost:${PORT}/api-docs`,
+    endpoints: {
+      'GET /api/resources': 'List all resources (with optional filters)',
+      'GET /api/resources/:id': 'Get resource by ID',
+      'POST /api/resources': 'Create a new resource',
+      'PUT /api/resources/:id': 'Update a resource',
+      'DELETE /api/resources/:id': 'Delete a resource'
+    }
+  });
+});
+
+app.use('/api/resources', resourceRoutes);
+
+// Error handling middleware
+app.use(errorHandler);
+
+// Start server
+app.listen(PORT, () => {
+  console.log(`🚀 Server is running on http://localhost:${PORT}`);
+  console.log(`📝 API documentation available at http://localhost:${PORT}/api-docs`);
+});
+
+export default app;
diff --git a/src/problem5/src/types/resource.ts b/src/problem5/src/types/resource.ts
new file mode 100644
index 000000000..72f8fc50d
--- /dev/null
+++ b/src/problem5/src/types/resource.ts
@@ -0,0 +1,32 @@
+export interface Resource {
+  id: string;
+  name: string;
+  description: string;
+  type: string;
+  status: 'active' | 'inactive';
+  createdAt: string;
+  updatedAt: string;
+  metadata?: Record<string, any>;
+}
+
+export interface CreateResourceDTO {
+  name: string;
+  description: string;
+  type: string;
+  status?: 'active' | 'inactive';
+  metadata?: Record<string, any>;
+}
+
+export interface UpdateResourceDTO {
+  name?: string;
+  description?: string;
+  type?: string;
+  status?: 'active' | 'inactive';
+  metadata?: Record<string, any>;
+}
+
+export interface ResourceFilter {
+  type?: string;
+  status?: 'active' | 'inactive';
+  search?: string;
+}
diff --git a/src/problem5/tsconfig.json b/src/problem5/tsconfig.json
new file mode 100644
index 000000000..8aa0a6f66
--- /dev/null
+++ b/src/problem5/tsconfig.json
@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "commonjs",
+    "lib": ["ES2020"],
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "types": ["node"]
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/src/problem6/README.md b/src/problem6/README.md
new file mode 100644
index 000000000..c1d856d48
--- /dev/null
+++ b/src/problem6/README.md
@@ -0,0 +1,1344 @@
+# Problem 6: Real-Time Score Board API Service - Architecture Specification
+
+## 📋 Table of Contents
+
+- [Overview](#overview)
+- [System Architecture](#system-architecture)
+- [Component Design](#component-design)
+- [API Specifications](#api-specifications)
+- [Data Models](#data-models)
+- [Execution Flow Diagrams](#execution-flow-diagrams)
+- [Security & Authorization](#security--authorization)
+- [Real-Time Updates](#real-time-updates)
+- [Performance Considerations](#performance-considerations)
+- [Deployment Architecture](#deployment-architecture)
+- [Improvements & Recommendations](#improvements--recommendations)
+
+---
+
+## Overview
+
+This document specifies the architecture for a **Real-Time Score Board API Service** that enables:
+- Live score updates for users performing actions
+- Top 10 leaderboard display
+- Secure, authorized score increments
+- Real-time updates to all connected clients
+- Protection against malicious score manipulation
+
+### Key Requirements
+
+1. ✅ Display top 10 users on a live score board
+2. ✅ Real-time score board updates across all clients
+3. ✅ User actions trigger score increments
+4. ✅ API calls to backend server for score updates
+5. ✅ Prevention of unauthorized score manipulation
+
+---
+
+## System Architecture
+
+### High-Level Architecture
+
+```
+┌─────────────────────────────────────────────────────────────────┐
+│                         Client Layer                            │
+│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐           │
+│  │   Web App    │  │   Web App    │  │   Web App    │           │
+│  │  (Browser)   │  │  (Browser)   │  │  (Browser)   │           │
+│  └──────┬───────┘  └──────┬───────┘  └──────┬───────┘           │
+│         │                  │                  │                 │
+│         │ WebSocket        │ WebSocket        │ WebSocket       │
+│         │ REST API         │ REST API         │ REST API        │
+└─────────┼──────────────────┼──────────────────┼─────────────────┘
+          │                  │                  │
+          ▼                  ▼                  ▼
+┌─────────────────────────────────────────────────────────────────┐
+│                      Load Balancer (Optional)                   │
+└─────────────────────────────────────────────────────────────────┘
+          │
+          ▼
+┌─────────────────────────────────────────────────────────────────┐
+│                      Application Server                         │
+│  ┌──────────────────────────────────────────────────────────┐   │
+│  │              API Gateway / Express Server                │   │
+│  │  ┌────────────┐  ┌────────────┐  ┌──────────────────┐    │   │
+│  │  │  REST API  │  │ WebSocket  │  │  Auth Middleware │    │   │
+│  │  │ Endpoints  │  │   Server   │  │                  │    │   │
+│  │  └────────────┘  └────────────┘  └──────────────────┘    │   │
+│  └──────────────────────────────────────────────────────────┘   │
+│  ┌──────────────────────────────────────────────────────────┐   │
+│  │                  Business Logic Layer                    │   │
+│  │  ┌──────────────┐  ┌─────────────┐  ┌───────────────┐    │   │
+│  │  │Score Service │  │Auth Service │  │  Leaderboard  │    │   │
+│  │  │              │  │             │  │   Service     │    │   │
+│  │  └──────────────┘  └─────────────┘  └───────────────┘    │   │
+│  └──────────────────────────────────────────────────────────┘   │
+│  ┌──────────────────────────────────────────────────────────┐   │
+│  │                     Cache Layer (Redis)                  │   │
+│  │  - Top 10 Leaderboard Cache                              │   │
+│  │  - User Session Data                                     │   │
+│  │  - Rate Limiting Counters                                │   │
+│  └──────────────────────────────────────────────────────────┘   │
+└─────────────────────────────────────────────────────────────────┘
+          │
+          ▼
+┌─────────────────────────────────────────────────────────────────┐
+│                      Database Layer                             │
+│  ┌──────────────────┐         ┌────────────────────────┐        │
+│  │  Primary DB      │◄───────►│   Read Replicas        │        │
+│  │  (PostgreSQL/    │         │   (Optional for scale) │        │
+│  │   MySQL)         │         │                        │        │
+│  │  - Users         │         │                        │        │
+│  │  - Scores        │         │                        │        │
+│  │  - Actions Log   │         │                        │        │
+│  └──────────────────┘         └────────────────────────┘        │
+└─────────────────────────────────────────────────────────────────┘
+```
+
+---
+
+## Component Design
+
+### 1. **API Gateway / Express Server**
+
+**Responsibilities:**
+- Handle incoming HTTP/HTTPS requests
+- Route requests to appropriate services
+- Manage WebSocket connections for real-time updates
+- Apply authentication and authorization middleware
+- Rate limiting and request validation
+
+**Tech Stack:**
+- **Framework**: Express.js or Fastify
+- **WebSocket**: Socket.io or ws
+- **Language**: Node.js (TypeScript)
+
+### 2. **Authentication & Authorization Service**
+
+**Responsibilities:**
+- Verify user identity (JWT tokens, session tokens)
+- Validate action authorization (ensure user can perform the action)
+- Generate and verify cryptographic signatures for action completion
+- Maintain session state
+
+**Security Mechanisms:**
+- JWT (JSON Web Tokens) with short expiration
+- Action tokens with HMAC signatures
+- CSRF protection
+- Rate limiting per user
+
+### 3. **Score Service**
+
+**Responsibilities:**
+- Process score increment requests
+- Validate action completion proofs
+- Update user scores in database
+- Emit events for leaderboard updates
+- Maintain audit log of score changes
+
+**Key Features:**
+- Idempotency keys to prevent duplicate submissions
+- Atomic database transactions
+- Action validation against server-side rules
+
+### 4. **Leaderboard Service**
+
+**Responsibilities:**
+- Fetch and cache top 10 users
+- Broadcast updates to connected clients via WebSocket
+- Handle leaderboard queries efficiently
+- Maintain real-time ranking calculations
+
+### 5. **Cache Layer (Redis)**
+
+**Purpose:**
+- Store top 10 leaderboard (Sorted Set)
+- Cache user session data
+- Rate limiting counters
+- Action completion tokens (with TTL)
+
+### 6. **Database Layer**
+
+**Primary Database Schema:**
+
+```sql
+-- Users table
+CREATE TABLE users (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    username VARCHAR(50) UNIQUE NOT NULL,
+    email VARCHAR(255) UNIQUE NOT NULL,
+    total_score BIGINT DEFAULT 0,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Scores/Actions table
+CREATE TABLE score_events (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id UUID REFERENCES users(id),
+    action_type VARCHAR(50) NOT NULL,
+    points_earned INT NOT NULL,
+    action_token VARCHAR(255) UNIQUE NOT NULL,
+    metadata JSONB,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    INDEX idx_user_id (user_id),
+    INDEX idx_created_at (created_at),
+    INDEX idx_action_token (action_token)
+);
+
+-- Leaderboard materialized view (for performance)
+CREATE MATERIALIZED VIEW leaderboard_top_100 AS
+SELECT 
+    u.id,
+    u.username,
+    u.total_score,
+    RANK() OVER (ORDER BY u.total_score DESC) as rank
+FROM users u
+ORDER BY u.total_score DESC
+LIMIT 100;
+
+-- Index for fast leaderboard queries
+CREATE INDEX idx_users_score ON users(total_score DESC);
+```
+
+---
+
+## API Specifications
+
+### Base URL
+```
+https://api.example.com/v1
+```
+
+### Authentication
+All API requests require authentication via JWT token in the `Authorization` header:
+```
+Authorization: Bearer <jwt_token>
+```
+
+---
+
+### 1. **Get Top 10 Leaderboard**
+
+```http
+GET /leaderboard/top10
+```
+
+**Response:**
+```json
+{
+  "success": true,
+  "data": {
+    "leaderboard": [
+      {
+        "rank": 1,
+        "userId": "uuid-123",
+        "username": "player1",
+        "score": 15000
+      },
+      {
+        "rank": 2,
+        "userId": "uuid-456",
+        "username": "player2",
+        "score": 12500
+      }
+      // ... up to 10 users
+    ],
+    "lastUpdated": "2026-01-25T10:30:00Z"
+  }
+}
+```
+
+---
+
+### 2. **Request Action Token (Pre-authorization)**
+
+Before a user performs an action, they request a cryptographically signed token:
+
+```http
+POST /actions/request-token
+```
+
+**Request Body:**
+```json
+{
+  "actionType": "complete_task"
+}
+```
+
+**Response:**
+```json
+{
+  "success": true,
+  "data": {
+    "actionToken": "eyJhbGc...",  // HMAC-signed token
+    "expiresAt": "2026-01-25T10:35:00Z",  // 5 minutes TTL
+    "expectedPoints": 100
+  }
+}
+```
+
+**Purpose:** 
+- Server pre-authorizes the action
+- Token contains: userId, actionType, timestamp, nonce
+- Token is stored in Redis with TTL
+- Prevents replay attacks
+
+---
+
+### 3. **Submit Action Completion (Update Score)**
+
+After completing the action, client submits the token:
+
+```http
+POST /scores/submit-action
+```
+
+**Request Body:**
+```json
+{
+  "actionToken": "eyJhbGc...",  // Token from step 2
+  "actionProof": {
+    "completedAt": "2026-01-25T10:33:00Z",
+    "metadata": {
+      // Optional action-specific data
+    }
+  }
+}
+```
+
+**Response:**
+```json
+{
+  "success": true,
+  "data": {
+    "pointsEarned": 100,
+    "newTotalScore": 5600,
+    "newRank": 15,
+    "wasInTop10": false
+  }
+}
+```
+
+**Server-side Processing:**
+1. Verify JWT authentication
+2. Validate `actionToken` signature
+3. Check token hasn't been used (idempotency)
+4. Verify token hasn't expired
+5. Mark token as consumed in Redis
+6. Update user score in database (atomic transaction)
+7. Update leaderboard cache
+8. Broadcast WebSocket event if top 10 changed
+9. Return result
+
+---
+
+### 4. **Get User Profile & Score**
+
+```http
+GET /users/me
+```
+
+**Response:**
+```json
+{
+  "success": true,
+  "data": {
+    "userId": "uuid-123",
+    "username": "player1",
+    "totalScore": 5600,
+    "rank": 15,
+    "recentActions": [
+      {
+        "actionType": "complete_task",
+        "points": 100,
+        "timestamp": "2026-01-25T10:33:00Z"
+      }
+    ]
+  }
+}
+```
+
+---
+
+### 5. **WebSocket Events**
+
+**Connection:**
+```javascript
+const socket = io('wss://api.example.com', {
+  auth: {
+    token: 'jwt_token_here'
+  }
+});
+```
+
+**Server → Client Events:**
+
+```javascript
+// Leaderboard update
+socket.on('leaderboard:update', (data) => {
+  // {
+  //   leaderboard: [...top 10 users],
+  //   updatedAt: "2026-01-25T10:33:00Z"
+  // }
+});
+
+// User's score updated
+socket.on('score:updated', (data) => {
+  // {
+  //   userId: "uuid-123",
+  //   newScore: 5700,
+  //   pointsEarned: 100,
+  //   newRank: 14
+  // }
+});
+
+// User entered top 10
+socket.on('leaderboard:entry', (data) => {
+  // {
+  //   userId: "uuid-123",
+  //   username: "player1",
+  //   rank: 10,
+  //   score: 10000
+  // }
+});
+```
+
+---
+
+## Data Models
+
+### TypeScript Interfaces
+
+```typescript
+// User Model
+interface User {
+  id: string;
+  username: string;
+  email: string;
+  totalScore: number;
+  createdAt: Date;
+  updatedAt: Date;
+}
+
+// Score Event Model
+interface ScoreEvent {
+  id: string;
+  userId: string;
+  actionType: string;
+  pointsEarned: number;
+  actionToken: string;
+  metadata?: Record<string, any>;
+  createdAt: Date;
+}
+
+// Leaderboard Entry
+interface LeaderboardEntry {
+  rank: number;
+  userId: string;
+  username: string;
+  score: number;
+}
+
+// Action Token Payload
+interface ActionTokenPayload {
+  userId: string;
+  actionType: string;
+  expectedPoints: number;
+  nonce: string;
+  issuedAt: number;
+  expiresAt: number;
+}
+
+// Action Submission
+interface ActionSubmission {
+  actionToken: string;
+  actionProof: {
+    completedAt: Date;
+    metadata?: Record<string, any>;
+  };
+}
+```
+
+---
+
+## Execution Flow Diagrams
+
+### Flow 1: User Action Completion & Score Update
+
+```mermaid
+sequenceDiagram
+    participant Client as Web Client
+    participant API as API Server
+    participant Auth as Auth Service
+    participant Score as Score Service
+    participant DB as Database
+    participant Cache as Redis Cache
+    participant WS as WebSocket Server
+
+    Note over Client,WS: Phase 1: Request Action Token
+    Client->>API: POST /actions/request-token
+    API->>Auth: Verify JWT & User
+    Auth-->>API: User Authenticated
+    API->>Score: Generate Action Token
+    Score->>Cache: Store Token (TTL: 5min)
+    Score-->>API: Return Signed Token
+    API-->>Client: { actionToken, expiresAt }
+
+    Note over Client,WS: Phase 2: User Completes Action (Client-side)
+    Client->>Client: User performs action
+    Client->>Client: Action completed successfully
+
+    Note over Client,WS: Phase 3: Submit Action & Update Score
+    Client->>API: POST /scores/submit-action
+    API->>Auth: Verify JWT
+    Auth-->>API: Authenticated
+    API->>Score: Validate Action Token
+    Score->>Cache: Check Token Exists & Not Used
+    Cache-->>Score: Token Valid
+    Score->>Cache: Mark Token as Consumed
+    Score->>DB: BEGIN TRANSACTION
+    Score->>DB: INSERT INTO score_events
+    Score->>DB: UPDATE users SET total_score = total_score + points
+    Score->>DB: COMMIT TRANSACTION
+    DB-->>Score: Success
+    Score->>Cache: Update Leaderboard Cache
+    Cache-->>Score: Leaderboard Updated
+    Score->>WS: Emit leaderboard:update event
+    WS->>Client: Broadcast to all connected clients
+    Score-->>API: { newScore, newRank, pointsEarned }
+    API-->>Client: Success Response
+
+    Note over Client,WS: Phase 4: Real-time Update
+    WS->>Client: leaderboard:update event
+    Client->>Client: Update UI with new leaderboard
+```
+
+### Flow 2: Real-Time Leaderboard Updates
+
+```
+┌─────────────┐
+│   User A    │
+│  (Client)   │
+└──────┬──────┘
+       │
+       │ 1. Complete Action
+       ├──────────────────────────────────┐
+       │                                   ▼
+       │                          ┌────────────────┐
+       │                          │  API Server    │
+       │                          │  Score Service │
+       │                          └────────┬───────┘
+       │                                   │
+       │                          2. Update Database
+       │                                   │
+       │                                   ▼
+       │                          ┌────────────────┐
+       │                          │   PostgreSQL   │
+       │                          │  total_score++ │
+       │                          └────────┬───────┘
+       │                                   │
+       │                          3. Update Cache
+       │                                   │
+       │                                   ▼
+       │                          ┌────────────────┐
+       │                          │ Redis (ZADD)   │
+       │                          │  Leaderboard   │
+       │                          └────────┬───────┘
+       │                                   │
+       │                          4. Broadcast Event
+       │                                   │
+       │                                   ▼
+       │                          ┌────────────────┐
+┌──────▼──────┐                  │  WebSocket Hub │
+│   User A    │◄─────────────────┤                ├─────────────┐
+│  (Updated)  │   5. WS Event    │  Socket.io     │  5. WS Event│
+└─────────────┘                  └────────────────┘             │
+                                                                 │
+┌─────────────┐                                        ┌────────▼──────┐
+│   User B    │◄───────────────────────────────────────│   User C      │
+│ (Spectator) │              5. WS Event               │  (Spectator)  │
+└─────────────┘                                        └───────────────┘
+
+All users see updated leaderboard in real-time!
+```
+
+### Flow 3: Security Token Validation
+
+```
+Client Request
+      │
+      ▼
+┌─────────────────────────────────────┐
+│   1. Extract JWT from Header        │
+│      Authorization: Bearer <token>  │
+└──────────────┬──────────────────────┘
+               │
+               ▼
+┌─────────────────────────────────────┐
+│   2. Verify JWT Signature           │
+│      - Check expiration             │
+│      - Validate issuer              │
+│      - Extract userId               │
+└──────────────┬──────────────────────┘
+               │
+               ├── Invalid ──► 401 Unauthorized
+               │
+               ▼ Valid
+┌─────────────────────────────────────┐
+│   3. Verify Action Token (HMAC)     │
+│      - Signature validation         │
+│      - Check expiration (5 min)     │
+│      - Extract payload              │
+└──────────────┬──────────────────────┘
+               │
+               ├── Invalid ──► 400 Bad Request
+               │
+               ▼ Valid
+┌─────────────────────────────────────┐
+│   4. Check Token Usage (Redis)      │
+│      GET action_token:<token>       │
+└──────────────┬──────────────────────┘
+               │
+               ├── Already Used ──► 409 Conflict
+               │
+               ▼ Not Used
+┌─────────────────────────────────────┐
+│   5. Mark Token as Consumed         │
+│      SET action_token:<token> 1     │
+│      EXPIRE 3600 (1 hour TTL)       │
+└──────────────┬──────────────────────┘
+               │
+               ▼
+┌─────────────────────────────────────┐
+│   6. Process Score Update           │
+│      (Atomic Transaction)           │
+└─────────────────────────────────────┘
+```
+
+---
+
+## Security & Authorization
+
+### 1. **Action Token System (Preventing Unauthorized Score Increases)**
+
+**Problem:** Prevent users from directly calling the score update API without actually completing actions.
+
+**Solution: Two-Phase Token System**
+
+**Phase 1: Token Request**
+```typescript
+// Server generates a cryptographically signed token
+const actionToken = {
+  userId: user.id,
+  actionType: 'complete_task',
+  expectedPoints: 100,
+  nonce: crypto.randomBytes(16).toString('hex'),
+  issuedAt: Date.now(),
+  expiresAt: Date.now() + 5 * 60 * 1000 // 5 minutes
+};
+
+// Sign with HMAC
+const signature = crypto
+  .createHmac('sha256', process.env.ACTION_SECRET)
+  .update(JSON.stringify(actionToken))
+  .digest('hex');
+
+const signedToken = `${Buffer.from(JSON.stringify(actionToken)).toString('base64')}.${signature}`;
+
+// Store in Redis with TTL
+await redis.setex(`action_token:${signature}`, 300, JSON.stringify(actionToken));
+```
+
+**Phase 2: Token Submission**
+```typescript
+// Client submits the token after completing action
+// Server verifies:
+1. Token signature is valid
+2. Token hasn't expired
+3. Token hasn't been used before (check Redis)
+4. User ID in token matches authenticated user
+5. Action type is allowed
+```
+
+**Benefits:**
+- Server controls when actions can be performed
+- Tokens expire quickly (5 minutes)
+- One-time use only (idempotency)
+- Cryptographic signature prevents tampering
+- No client-side score calculation
+
+### 2. **Rate Limiting**
+
+**Per-User Rate Limiting:**
+```typescript
+// Using Redis
+const rateLimitKey = `rate_limit:${userId}:${actionType}`;
+const requestCount = await redis.incr(rateLimitKey);
+
+if (requestCount === 1) {
+  await redis.expire(rateLimitKey, 60); // 1 minute window
+}
+
+if (requestCount > 10) { // Max 10 actions per minute
+  throw new TooManyRequestsError();
+}
+```
+
+**Global Rate Limiting:**
+```typescript
+// Using middleware like express-rate-limit
+import rateLimit from 'express-rate-limit';
+
+const apiLimiter = rateLimit({
+  windowMs: 15 * 60 * 1000, // 15 minutes
+  max: 100, // Limit each IP to 100 requests per windowMs
+  standardHeaders: true,
+  legacyHeaders: false,
+});
+
+app.use('/api/', apiLimiter);
+```
+
+### 3. **Input Validation**
+
+```typescript
+import { z } from 'zod';
+
+const ActionSubmissionSchema = z.object({
+  actionToken: z.string().min(1),
+  actionProof: z.object({
+    completedAt: z.string().datetime(),
+    metadata: z.record(z.any()).optional()
+  })
+});
+
+// Validate request body
+const validatedData = ActionSubmissionSchema.parse(req.body);
+```
+
+### 4. **SQL Injection Prevention**
+
+Use parameterized queries or ORM:
+```typescript
+// ✅ Good: Parameterized query
+const result = await db.query(
+  'UPDATE users SET total_score = total_score + $1 WHERE id = $2',
+  [points, userId]
+);
+
+// ❌ Bad: String concatenation
+// const result = await db.query(`UPDATE users SET total_score = total_score + ${points} WHERE id = '${userId}'`);
+```
+
+### 5. **Audit Logging**
+
+```typescript
+// Log all score changes
+await db.query(`
+  INSERT INTO score_events (user_id, action_type, points_earned, action_token, metadata)
+  VALUES ($1, $2, $3, $4, $5)
+`, [userId, actionType, points, actionToken, metadata]);
+
+// Benefits:
+// - Detect suspicious patterns
+// - Forensic analysis
+// - Fraud detection
+// - Compliance
+```
+
+---
+
+## Real-Time Updates
+
+### WebSocket Implementation (Socket.io)
+
+**Server Setup:**
+```typescript
+import { Server } from 'socket.io';
+import { verify } from 'jsonwebtoken';
+
+const io = new Server(httpServer, {
+  cors: {
+    origin: process.env.CLIENT_URL,
+    credentials: true
+  }
+});
+
+// Authentication middleware
+io.use(async (socket, next) => {
+  try {
+    const token = socket.handshake.auth.token;
+    const decoded = verify(token, process.env.JWT_SECRET);
+    socket.data.userId = decoded.userId;
+    next();
+  } catch (err) {
+    next(new Error('Authentication failed'));
+  }
+});
+
+// Connection handler
+io.on('connection', (socket) => {
+  console.log(`User ${socket.data.userId} connected`);
+  
+  // Join user's personal room
+  socket.join(`user:${socket.data.userId}`);
+  
+  // Join global leaderboard room
+  socket.join('leaderboard');
+  
+  socket.on('disconnect', () => {
+    console.log(`User ${socket.data.userId} disconnected`);
+  });
+});
+
+// Broadcast leaderboard updates
+export function broadcastLeaderboardUpdate(leaderboard: LeaderboardEntry[]) {
+  io.to('leaderboard').emit('leaderboard:update', {
+    leaderboard,
+    updatedAt: new Date().toISOString()
+  });
+}
+
+// Notify specific user
+export function notifyUserScoreUpdate(userId: string, data: any) {
+  io.to(`user:${userId}`).emit('score:updated', data);
+}
+```
+
+**Client Implementation:**
+```typescript
+import io from 'socket.io-client';
+
+const socket = io('wss://api.example.com', {
+  auth: {
+    token: localStorage.getItem('jwt_token')
+  }
+});
+
+socket.on('connect', () => {
+  console.log('Connected to WebSocket');
+});
+
+socket.on('leaderboard:update', (data) => {
+  // Update UI with new leaderboard
+  updateLeaderboardUI(data.leaderboard);
+});
+
+socket.on('score:updated', (data) => {
+  // Update user's score display
+  updateUserScore(data.newScore, data.pointsEarned);
+});
+
+socket.on('disconnect', () => {
+  console.log('Disconnected from WebSocket');
+  // Implement reconnection logic
+});
+```
+
+---
+
+## Performance Considerations
+
+### 1. **Leaderboard Caching Strategy**
+
+**Redis Sorted Set:**
+```typescript
+// Update leaderboard in Redis when score changes
+async function updateLeaderboardCache(userId: string, username: string, newScore: number) {
+  await redis.zadd('leaderboard:global', newScore, `${userId}:${username}`);
+  
+  // Keep only top 100 for efficiency
+  await redis.zremrangebyrank('leaderboard:global', 0, -101);
+}
+
+// Fetch top 10
+async function getTop10() {
+  const top10 = await redis.zrevrange('leaderboard:global', 0, 9, 'WITHSCORES');
+  
+  return top10.map((entry, index) => {
+    const [userId, username] = entry.split(':');
+    const score = top10[index + 1];
+    return { rank: Math.floor(index / 2) + 1, userId, username, score };
+  });
+}
+```
+
+**Cache Invalidation:**
+- Update cache on every score change
+- Set TTL of 5 minutes as fallback
+- Rebuild from database if cache miss
+
+### 2. **Database Optimization**
+
+**Indexes:**
+```sql
+-- Fast leaderboard queries
+CREATE INDEX idx_users_score ON users(total_score DESC);
+
+-- Fast user lookups
+CREATE INDEX idx_users_id ON users(id);
+
+-- Fast score event queries
+CREATE INDEX idx_score_events_user_id ON score_events(user_id);
+CREATE INDEX idx_score_events_token ON score_events(action_token);
+```
+
+**Materialized Views:**
+```sql
+-- Pre-computed leaderboard
+CREATE MATERIALIZED VIEW leaderboard_top_100 AS
+SELECT 
+    u.id,
+    u.username,
+    u.total_score,
+    RANK() OVER (ORDER BY u.total_score DESC) as rank
+FROM users u
+ORDER BY u.total_score DESC
+LIMIT 100;
+
+-- Refresh every minute
+REFRESH MATERIALIZED VIEW CONCURRENTLY leaderboard_top_100;
+```
+
+### 3. **Horizontal Scaling**
+
+**Stateless API Servers:**
+- Store sessions in Redis, not in-memory
+- Use load balancer for distributing requests
+- Enable WebSocket sticky sessions
+
+**Redis Cluster:**
+- Shard data across multiple Redis nodes
+- Use Redis Sentinel for high availability
+
+**Database Read Replicas:**
+- Direct read queries to replicas
+- Write operations to primary
+- Eventual consistency acceptable for leaderboard
+
+### 4. **Connection Pooling**
+
+```typescript
+// PostgreSQL connection pool
+import { Pool } from 'pg';
+
+const pool = new Pool({
+  host: process.env.DB_HOST,
+  port: 5432,
+  database: process.env.DB_NAME,
+  user: process.env.DB_USER,
+  password: process.env.DB_PASSWORD,
+  max: 20, // Maximum pool size
+  idleTimeoutMillis: 30000,
+  connectionTimeoutMillis: 2000,
+});
+```
+
+---
+
+## Deployment Architecture
+
+### Production Environment
+
+```
+┌──────────────────────────────────────────────────────────┐
+│                     Cloud Provider (AWS/GCP/Azure)       │
+│                                                           │
+│  ┌────────────────────────────────────────────────────┐  │
+│  │  CDN (CloudFront / CloudFlare)                     │  │
+│  │  - Cache static assets                             │  │
+│  │  - DDoS protection                                 │  │
+│  └────────────┬───────────────────────────────────────┘  │
+│               │                                           │
+│  ┌────────────▼───────────────────────────────────────┐  │
+│  │  Load Balancer (ALB / NLB)                         │  │
+│  │  - SSL/TLS termination                             │  │
+│  │  - Health checks                                   │  │
+│  │  - Sticky sessions for WebSocket                   │  │
+│  └────────┬───────────────────────┬───────────────────┘  │
+│           │                       │                       │
+│  ┌────────▼────────┐     ┌───────▼──────────┐           │
+│  │  API Server 1   │     │  API Server 2    │           │
+│  │  (Container)    │     │  (Container)     │           │
+│  │  - Express.js   │     │  - Express.js    │           │
+│  │  - Socket.io    │     │  - Socket.io     │           │
+│  └────────┬────────┘     └───────┬──────────┘           │
+│           │                       │                       │
+│           └───────────┬───────────┘                       │
+│                       │                                   │
+│  ┌────────────────────▼────────────────────────────────┐ │
+│  │  Redis Cluster (ElastiCache / Memorystore)         │ │
+│  │  - Primary + Replicas                              │ │
+│  │  - Automatic failover                              │ │
+│  └─────────────────────────────────────────────────────┘ │
+│                       │                                   │
+│  ┌────────────────────▼────────────────────────────────┐ │
+│  │  PostgreSQL (RDS / Cloud SQL)                      │ │
+│  │  - Primary + Read Replicas                         │ │
+│  │  - Automated backups                               │ │
+│  │  - Multi-AZ deployment                             │ │
+│  └─────────────────────────────────────────────────────┘ │
+└──────────────────────────────────────────────────────────┘
+```
+
+### Container Orchestration (Kubernetes)
+
+```yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: scoreboard-api
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: scoreboard-api
+  template:
+    metadata:
+      labels:
+        app: scoreboard-api
+    spec:
+      containers:
+      - name: api
+        image: scoreboard-api:latest
+        ports:
+        - containerPort: 3000
+        env:
+        - name: DATABASE_URL
+          valueFrom:
+            secretKeyRef:
+              name: db-credentials
+              key: url
+        - name: REDIS_URL
+          valueFrom:
+            secretKeyRef:
+              name: redis-credentials
+              key: url
+        resources:
+          requests:
+            memory: "256Mi"
+            cpu: "250m"
+          limits:
+            memory: "512Mi"
+            cpu: "500m"
+        livenessProbe:
+          httpGet:
+            path: /health
+            port: 3000
+          initialDelaySeconds: 30
+          periodSeconds: 10
+```
+
+---
+
+## Improvements & Recommendations
+
+### 1. **Enhanced Security**
+
+#### Implement Device Fingerprinting
+```typescript
+// Track devices to detect suspicious activity
+const deviceFingerprint = crypto
+  .createHash('sha256')
+  .update(userAgent + ipAddress + acceptLanguage)
+  .digest('hex');
+
+await redis.setex(`device:${userId}:${deviceFingerprint}`, 86400, '1');
+```
+
+#### Add Anomaly Detection
+```typescript
+// Detect unusual score patterns
+async function detectAnomalies(userId: string, points: number) {
+  const recentScores = await db.query(`
+    SELECT points_earned, created_at 
+    FROM score_events 
+    WHERE user_id = $1 
+    AND created_at > NOW() - INTERVAL '1 hour'
+    ORDER BY created_at DESC
+    LIMIT 20
+  `, [userId]);
+  
+  // Check for:
+  // - Too many actions in short time
+  // - Unusually high point values
+  // - Perfect timing patterns (bot-like behavior)
+  
+  if (isAnomaly(recentScores, points)) {
+    await flagForReview(userId);
+    await notifyAdmin(userId, 'Suspicious activity detected');
+  }
+}
+```
+
+#### Implement CAPTCHA for Suspicious Users
+```typescript
+// Require CAPTCHA verification if flagged
+if (user.isFlagged) {
+  const captchaValid = await verifyCaptcha(req.body.captchaToken);
+  if (!captchaValid) {
+    throw new Error('CAPTCHA verification failed');
+  }
+}
+```
+
+### 2. **Performance Enhancements**
+
+#### Implement Pagination for History
+```typescript
+// GET /users/me/history?page=1&limit=20
+app.get('/users/me/history', async (req, res) => {
+  const page = parseInt(req.query.page) || 1;
+  const limit = parseInt(req.query.limit) || 20;
+  const offset = (page - 1) * limit;
+  
+  const history = await db.query(`
+    SELECT * FROM score_events
+    WHERE user_id = $1
+    ORDER BY created_at DESC
+    LIMIT $2 OFFSET $3
+  `, [req.user.id, limit, offset]);
+  
+  res.json({ data: history, page, limit });
+});
+```
+
+#### Add GraphQL for Flexible Queries
+```typescript
+// Allow clients to request exactly what they need
+type Query {
+  leaderboard(top: Int = 10): [LeaderboardEntry!]!
+  user(id: ID!): User
+  me: User
+}
+
+type User {
+  id: ID!
+  username: String!
+  score: Int!
+  rank: Int!
+  recentActions(limit: Int = 10): [ScoreEvent!]!
+}
+```
+
+#### Implement CDN for Static Leaderboard
+```typescript
+// Cache leaderboard HTML/JSON at edge locations
+// Update cache every 5 seconds via webhook
+app.get('/leaderboard/static', async (req, res) => {
+  res.set('Cache-Control', 'public, max-age=5');
+  const leaderboard = await getTop10FromCache();
+  res.json(leaderboard);
+});
+```
+
+### 3. **Monitoring & Observability**
+
+#### Add Comprehensive Logging
+```typescript
+import winston from 'winston';
+
+const logger = winston.createLogger({
+  level: 'info',
+  format: winston.format.json(),
+  transports: [
+    new winston.transports.File({ filename: 'error.log', level: 'error' }),
+    new winston.transports.File({ filename: 'combined.log' })
+  ]
+});
+
+// Log all score updates
+logger.info('Score updated', {
+  userId,
+  actionType,
+  pointsEarned,
+  newScore,
+  timestamp: new Date()
+});
+```
+
+#### Implement Metrics Collection
+```typescript
+import prometheus from 'prom-client';
+
+const scoreUpdatesCounter = new prometheus.Counter({
+  name: 'score_updates_total',
+  help: 'Total number of score updates',
+  labelNames: ['action_type', 'status']
+});
+
+const leaderboardCacheHitRatio = new prometheus.Gauge({
+  name: 'leaderboard_cache_hit_ratio',
+  help: 'Cache hit ratio for leaderboard queries'
+});
+
+// Expose metrics endpoint
+app.get('/metrics', async (req, res) => {
+  res.set('Content-Type', prometheus.register.contentType);
+  res.end(await prometheus.register.metrics());
+});
+```
+
+#### Set Up Alerts
+```yaml
+# Prometheus alert rules
+groups:
+  - name: scoreboard_alerts
+    rules:
+      - alert: HighErrorRate
+        expr: rate(http_requests_total{status=~"5.."}[5m]) > 0.05
+        annotations:
+          summary: "High error rate detected"
+      
+      - alert: SlowDatabaseQueries
+        expr: histogram_quantile(0.95, rate(db_query_duration_seconds_bucket[5m])) > 1
+        annotations:
+          summary: "Database queries are slow"
+```
+
+### 4. **Feature Additions**
+
+#### Add Achievements System
+```typescript
+// Award badges for milestones
+const achievements = [
+  { id: 'first_100', name: 'Century', requirement: 100 },
+  { id: 'top_10', name: 'Elite Player', requirement: 'rank <= 10' },
+  { id: 'streak_7', name: 'Weekly Warrior', requirement: '7 day streak' }
+];
+
+async function checkAchievements(userId: string, newScore: number) {
+  // Check and award achievements
+  // Emit WebSocket event for achievement unlocked
+}
+```
+
+#### Implement Leaderboard Periods
+```typescript
+// Multiple leaderboards: daily, weekly, monthly, all-time
+app.get('/leaderboard/:period/top10', async (req, res) => {
+  const { period } = req.params; // 'daily', 'weekly', 'monthly', 'all-time'
+  
+  const startDate = getStartDateForPeriod(period);
+  
+  const leaderboard = await db.query(`
+    SELECT 
+      u.id, 
+      u.username, 
+      SUM(se.points_earned) as period_score,
+      RANK() OVER (ORDER BY SUM(se.points_earned) DESC) as rank
+    FROM users u
+    JOIN score_events se ON u.id = se.user_id
+    WHERE se.created_at >= $1
+    GROUP BY u.id, u.username
+    ORDER BY period_score DESC
+    LIMIT 10
+  `, [startDate]);
+  
+  res.json({ data: leaderboard });
+});
+```
+
+#### Add Social Features
+```typescript
+// Friend system
+// Compare scores with friends
+// Challenge friends
+// Share achievements
+```
+
+### 5. **Scalability Improvements**
+
+#### Implement Event-Driven Architecture
+```typescript
+// Use message queue (RabbitMQ, Kafka) for async processing
+import { EventEmitter } from 'events';
+
+const eventBus = new EventEmitter();
+
+// Producer
+eventBus.emit('score.updated', {
+  userId,
+  newScore,
+  pointsEarned,
+  timestamp: Date.now()
+});
+
+// Consumer
+eventBus.on('score.updated', async (data) => {
+  await updateLeaderboardCache(data);
+  await checkAchievements(data.userId, data.newScore);
+  await notifyFollowers(data.userId, data);
+});
+```
+
+#### Database Sharding Strategy
+```typescript
+// Shard users by ID range
+function getShardForUser(userId: string): string {
+  const hash = crypto.createHash('md5').update(userId).digest('hex');
+  const shardNumber = parseInt(hash.substring(0, 8), 16) % NUM_SHARDS;
+  return `shard_${shardNumber}`;
+}
+```
+
+### 6. **Testing Recommendations**
+
+```typescript
+// Unit tests
+describe('ScoreService', () => {
+  it('should update user score atomically', async () => {
+    const result = await scoreService.updateScore(userId, 100);
+    expect(result.newScore).toBe(previousScore + 100);
+  });
+  
+  it('should prevent duplicate token usage', async () => {
+    await scoreService.submitAction(token);
+    await expect(scoreService.submitAction(token)).rejects.toThrow('Token already used');
+  });
+});
+
+// Integration tests
+describe('API Endpoints', () => {
+  it('should return top 10 leaderboard', async () => {
+    const response = await request(app).get('/leaderboard/top10');
+    expect(response.status).toBe(200);
+    expect(response.body.data.leaderboard).toHaveLength(10);
+  });
+});
+
+// Load tests (using k6 or Artillery)
+// Performance benchmarks
+// Security penetration testing
+```
+
+---
+
+## Conclusion
+
+This architecture provides:
+
+✅ **Secure** score update mechanism with cryptographic tokens  
+✅ **Real-time** leaderboard updates via WebSocket  
+✅ **Scalable** design with caching and horizontal scaling  
+✅ **Performant** with Redis caching and database optimization  
+✅ **Auditable** with comprehensive logging  
+✅ **Extensible** for future features
+
+The two-phase token system ensures that only authorized actions result in score updates, preventing malicious users from artificially inflating their scores. The combination of WebSocket for real-time updates and Redis caching ensures the leaderboard stays responsive even under high load.
+
+### Next Steps for Implementation Team
+
+1. Set up development environment with PostgreSQL + Redis
+2. Implement authentication service with JWT
+3. Build score service with token generation and validation
+4. Develop WebSocket server for real-time updates
+5. Create leaderboard cache layer with Redis
+6. Implement rate limiting and security measures
+7. Add comprehensive testing suite
+8. Deploy to staging environment
+9. Perform load testing and security audit
+10. Deploy to production with monitoring
+
+**Estimated Implementation Time**: 4-6 weeks for MVP with a team of 3-4 backend engineers.