Koh Hom Engineer's field notes

The archive

Writing

Every note I've published, newest first: frontend architecture and web performance, software testing and reliability, system design write-ups, and field reports on AI-assisted engineering.

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2026

10 notes

  1. Understanding ecommerce growth data from an engineering perspective

    Engineering Case study 9 min read

  2. Designing an Operations Heartbeat System

    Engineering Case study 16 min read

  3. JavaScript garbage collection: generations, hosts, and leaks

    Engineering 4 min read

  4. How JavaScript runs: from source code to JIT optimization

    Engineering 9 min read

  5. Workspace v2 tab system performance: first load, hot switch, and background pressure

    Engineering Case study 8 min read

  6. Workspace v2 tab system: browser tabs inside a workspace

    Engineering Case study 9 min read

  7. Automated AI performance optimization with a harness and goal-driven loop

    AI & Agents Case study 6 min read

  8. Agent Skills: The Functional Blueprint for AI Agents

    AI & Agents 5 min read

  9. Vibe Coding vs Spec-Driven Coding: The Evolution of AI-Assisted Development

    AI & Agents 5 min read

  10. SEO from First Principles — A Deep Dive through My Blog's Overhaul

    AI & Agents 12 min read

2024

7 notes

  1. Building Fault Tolerant React App With Error Boundary(Error Boundary Best Practice)

    Engineering 3 min read

  2. React Runtime Performance Optimization

    Engineering 3 min read

  3. React Server Component Internals(Source Code Review)

    Engineering 8 min read

  4. Learning How React Hooks Work by Building a Naive useState

    Engineering 4 min read

  5. How to Design GOOD Test Cases

    Engineering 5 min read

  6. The Software Engineering Concept behind Tailwind CSS(Compared with StyleX)

    Engineering 4 min read

  7. Web Performance Optimization Strategies and Practices

    Engineering 4 min read

2023

6 notes

  1. Build a Redux from Scratch(Redux Source Code Review)

    Engineering 8 min read

  2. Crafting GPT-based Customer Support Chatbot from 0 to 1 — Algorithm Portion

    AI & Agents 5 min read

  3. Applying Automatic Testing in The Development Cycle

    Engineering 7 min read

  4. Introducing Code Complexity Metric: Cognitive Complexity

    Engineering 7 min read

  5. Use Modular Design with ChatGPT to Generate Code

    AI & Agents 4 min read

  6. How I Use ChatGPT in My Daily Work&Study?

    AI & Agents 7 min read

2022

8 notes

  1. Does Github Copilot Worth It?

    AI & Agents 5 min read

  2. How Testing Speeds Up Your Development

    Engineering 7 min read

  3. Some Common Mistakes in React Testing

    Engineering 7 min read

  4. Testing Best Practice Tdd

    Engineering 6 min read

  5. SICPJS 2. Building Abstractions with Data

    Systems & Learning 5 min read

  6. Build a Toy Browser with NodeJS

    Engineering 2 min read

  7. SICPJS 1. Building Abstractions with Functions

    Systems & Learning 13 min read

  8. SICPJS thinking about the book and study plan / catalog

    Systems & Learning 4 min read