ML.
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Software Engineer @ UJET · ex-Founder/CTO · Seoul, open to global roles

MARTIAN
LEE.

I move fast with AI — and keep the decisions that matter human.

↓ View projectsPostsCV ↗GitHub ↗
01 — ProjectsAll projects →
Mo

More Munch

Web Service

A lunch-recommendation service for office workers. It auto-collects nearby restaurants (discoverable via the OpenClaw skill-optimized API) and suggests a fresh lunch every day based on your visit history and ratings.

CheerCat

CheerCat

Mobile App

A daily journaling app that builds the habit of praising yourself every day — a small ritual for a positive mindset.

Earth Invaders

Earth Invaders

Arcade Game

A Phaser3 arcade shooter. Fend off the aliens invading Earth, classic arcade style.

Fish Tank Simulator

Fish Tank Simulator

Idle Game

A pixel-art idle productivity tool that blends a Pomodoro timer with an aquarium sim. Complete focus sessions to earn fish eggs, collect 12+ species, and grow your own tank.

02 — Recent postsAll posts →

I take large codebases apart and write down how they actually work.

2026년 6월 29일 · 22 min read · opencode / coding-agent

Analyzing OpenCode: What Does a Coding Agent Look Like When You Make It a Provider-Agnostic Headless Engine?

OpenCode externalizes model metadata to models.dev and even hand-rolls its own LLM protocol layer, so any provider attaches with a single line of data. A single Effect-based HTTP engine is shared by the TUI, web, desktop, Slack, and editors (ACP), while two generations — legacy and V2 — coexist. We analyze the structure against Qwen Code's single-vendor platform.

2026년 6월 29일 · 13 min read · llm / paper-reading

InstructGPT (2022) Paper Notes

Paper notes on InstructGPT covering its core method — the three-step RLHF recipe (SFT → reward model → PPO) — the alignment result where a 1.3B model beats 175B GPT-3, gains in truthfulness and toxicity, the alignment tax and PPO-ptx, and the limitations.

GPT-3 (2020) Paper Notes2026년 6월 21일
Why I Made Markdown the Source of Truth — Building a Dashboard with an AI Agent2026년 6월 4일
Semble Architecture Analysis: How an Agent-Oriented RAG Solves Code Search with Static Embeddings2026년 6월 3일
03 — ExperienceCV ↗

UJET — Software Engineer 2

UJET is AI-Powered Cloud Contact Center Platform for Premium CX · Rails · GCP · Node.js · TypeScript · Kubernetes

2024 - Present

Stepping — Founder / CTO

Stepping helps companies and brands navigate complex carbon-neutral processes and climate action projects to build a sustainable future. · Next.js · React · Nest.js · PostgreSQL · AWS · 0to1

2021 - 2023

Miso — Frontend Developer

South Korea's leading home services platform. Responsible for client app maintenance and back-office development to improve CX operations. · React · React Native · Redux · TypeScript

2020 - 2021
Open to senior / staff engineering roles — globally.
Email ↗GitHub ↗LinkedIn ↗