Backend Engineer | CS @ APU (May 2026) | Rust, Node.js, Kubernetes

Building distributed systems and infrastructure. Focused on performance optimization, fault tolerance, and scalable architectures.

• Kubernetes Authentication Infrastructure – Building Gateway API v1.4 external auth service. Migrated from Node.js to Rust, achieving 3x throughput improvement through systematic benchmarking.
• Production Microservices @ APU – Maintaining systems serving 6,000+ users. Eliminated 20+ hours/week of manual work through automation.

FastAPI-based financial gateway with Kafka event streaming. Implements sub-millisecond idempotency using Redis and enforces strict settlement windows (T+0, T+1) for transaction processing.

Stack: Python, FastAPI, Apache Kafka, Redis, Docker
Patterns: Event Sourcing, Idempotency, Async Processing

Key Features:

• Kafka-based event streaming for decoupled transaction processing
• Redis-backed idempotency to prevent double-spending
• Pydantic schema validation for financial data integrity
• OpenAPI/Swagger documentation

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Node.js payment processing system implementing double-entry accounting with async processing via AWS SQS FIFO. Built to understand production payment patterns.

Stack: Node.js, Express, PostgreSQL, Redis, AWS SQS, Docker
Patterns: Double-Entry Ledger, Idempotency, Async Workers

Key Features:

• Double-entry ledger for financial accuracy
• Redis-based idempotency for safe retries
• AWS SQS FIFO integration for async processing
• Background workers for transaction processing
• Full audit trail with ledger history

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Device Onboarding Portal (byod.apu.edu)
Self-service network authentication portal serving 6,000+ users. Reduced IT support tickets by 30%.
Stack: TypeScript, Node.js, Bootstrap, Docker

Photo Compliance Automation
Eliminated 20+ hours/week of manual ID photo validation by building automated reconciliation system processing 43,000+ records. Zero maintenance required since deployment.
Stack: Node.js, PeopleSoft API, Google Sheets API, Docker

Languages: Rust, Python, TypeScript, JavaScript, SQL
Backend: Node.js, FastAPI, Express
Infrastructure: Kubernetes, Docker, Apache Kafka, Redis, PostgreSQL
Cloud: AWS (SQS, Lambda, S3)
Patterns: Event Sourcing, CQRS, Idempotency, Double-Entry Accounting

• Email: gjun21@apu.edu
• LinkedIn: (www.linkedin.com/in/gerojun)
• Location: Los Angeles, CA
• Status: Graduating May 2026, seeking New Grad SWE roles

Work Authorization: 3 years (STEM OPT)

Currently seeking backend/infrastructure engineering roles for June 2026 start. Interested in distributed systems, payments, or Kubernetes ecosystem.