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KatoKode/README.md

Hi, I'm JD McIntosh

Systems Programmer | x86_64 Assembly & Low-Level C Specialist Low-level computer Low-level gear Low-level rocket

Location: The South
Twitter/X: @EdistoKato

I'm a low-level developer focused on hand-written x86_64 assembly and performance-critical C for Linux systems. My projects are useful for embedded, firmware, kernel, or optimization work.

Skills & Expertise

  • x86_64 Assembly Language (NASM): Deep knowledge of the System V AMD64 ABI, registers, calling conventions, stack management, and optimization techniques.
  • Low-Level C: Building shared libraries, custom data structures, recursive algorithms, and memory-safe code (Valgrind-clean).
  • Data Structures & Algorithms: Pure assembly implementations of balanced trees, dynamic structures, and utilities.
  • Systems Programming: Dependency-free designs ideal for constrained environments—no external libs (with exception of libc).
  • Proven memory safety and correctness in complex, recursive code.

Highlighted Projects

BTree
Single-Threaded B-Tree in x86_64 Assembly
Fully functional B-Tree with insertion, deletion, search, and rebalancing—all in assembly. C interface as a shared library. Benchmarks: ~350k–590k ops/sec depending on order. Valgrind-clean.

RBTree
Red-Black Tree in x86_64 Assembly
Classic RB-Tree with rotations, coloring, and full operations implemented from scratch in assembly. Clean C API.

ByteBuffer
Fixed-Size ByteBuffer in x86_64 Assembly
Bounds-checked byte buffer (84% assembly) with get/put for primitives (int16–64, float/double, varchar, bytes). Little-endian serialization, mark/reset/flip, shared library, and configurable C demo.

JSON
High-Performance JSON Parser/Builder
Lightweight, dependency-free JSON library with assembly optimizations for tokenization and parsing. Supports nested objects/arrays. 100% Valgrind-clean.

x86_64 Tutorial
Practical x86_64 Assembly Tutorial
Step-by-step guide building a real shared library (libutil.so) from assembly sources. Covers ABI, linking, and integration with C.

Other repos: Stack, Queue, List all in assembly with C wrappers.

Why Low-Level?

I enjoy working close to the hardware. These projects showcase production-grade techniques: correctness proofs, benchmarks, memory safety, and real-world usability.

Open to opportunities in embedded systems, firmware, kernel development, high-performance computing, or any role valuing assembly and systems expertise.

Feel free to star ⭐ or fork—thanks for visiting!

— JD

Pinned Loading

  1. BTree BTree Public

    Single-Threaded BTree Implementation in x86_64 Assembly Language with C interface as a Shared-Library

    Assembly 2

  2. RBTree RBTree Public

    Red-Black-Tree Implementation in x86_64 Assembly Language with C interface

    Assembly 2