Skip to content

Woohyun Lim — AI Engineer

Thinking it through, then thinking again — I’m Woohyun Lim, AI engineer.

For any problem I’m solving, I relentlessly question whether this is truly the right direction, then keep refining and verifying — just as doggedly — until it feels like the problem I defined is genuinely solved. I carry that same relentlessness into learning, making each new technology truly my own.

View selected work Get in touch

About me

Rather than reacting to change, I move first.

New technologies pour out every single day, and change is moving faster now than ever. Rather than passively reacting to that current, I try to stay a step ahead through the active work of learning. More than just noting that “something new came out,” I love putting it to the test on real problems and relentlessly thinking through where it could actually be useful.

Name
Woohyun Lim
Based in
Seoul, South Korea
Focus
Agents · evals · context engineering
Currently
Building harness in the open

It started with a game.

In high school I set out to make gaming my career and chased the pro-gamer path. I stepped off it myself when the game’s future clouded over, but I learned that I go furthest when I’m immersed in something I love. Engineering is the path I chose again by that standard. From the first programming class that hooked me to the AI engineering I do today, the object of my focus has changed — the standard I choose by hasn’t. I chose this path because I love it, so I throw myself in deeply, without regret.

I quit the game; the review habit stayed.

The habit from my pro-gamer days was the post-game review — replaying finished matches and pressing on what the better play would have been. When I took on the sentiment-analysis and MRC competitions, that habit became a real edge. The goal was always first place, and even as the score kept climbing I wasn’t satisfied — I kept hunting for what to improve next; even on breaks, my head was running the next improvement. Not stopping while things are going well — that is what immersion means to me.

I deliberately put my dream projects on hold.

Most of my time right now goes into harness engineering. An LLM has a hard limit on context length, and what goes into that window decides what comes out. To handle models well, I became convinced, you have to start by designing the very standard for what to show them and how far to trust them. So I’ve put the services I want to build on hold for now, and I’m focused on building a development environment with solid guardrails in place. I believe it’s only on this foundation that the projects I want to do can be done properly.

History

  1. 2026.03 — now

    Independent AI Engineer

    • Pushing my range as an agentic engineer — solving a wide variety of problems with AI in the loop.

  2. 2025.11 — 2026.02

    boostcamp AI Tech 8th · AI Core, NLP

    • Went deep into NLP while running competitions with teammates and building an AI product.

  3. 2025.09 — 2025.11

    boostcamp AI Tech 8th · AI Core

    • Covered NLP, CV, and RecSys end to end, implementing everything from historic models to the Transformer at PyTorch code level to build solid deep-learning foundations.
    • Ran a competition fine-tuning various BERT models and applying them to downstream tasks.

  4. 2025.06 — 2025.08

    boostcamp AI Tech 8th · Precourse

    • Studied linear algebra, statistics, and the foundations of machine learning and deep learning.

  5. 2024.01 — 2024.04

    AriBio · development team

    • Studied advanced RAG pipelines — self-query retrieval, hybrid search, and RAG fusion.
    • Joined development of a Flutter-based healthcare app, learning mobile UI and state-management patterns.

  6. 2022.02 — 2023.08

    ROK Army, 1st Infantry Division

    • Served 18 months in the 1st Infantry Division; honorably discharged as a sergeant.

  7. 2021.02 —

    Kookmin University, Intelligent Semiconductor & Electronic Engineering

    University

  8. 2017.02 — 2019.02

    Seoul High School

    High school

    • Chased a pro-gamer career — and learned how deeply I can immerse myself in something I love.

Selected work 01—03

Boostcamp AI Tech 04—07

Toolbox

Agentic Tools
Claude Code Codex CLI Harness Engineering
AI & ML
Pytorch Numpy Pandas Polars Huggingface Streamlit
Languages & runtime
Python TypeScript Dart Flutter
Web & infrastructure
Google App Script Cloudflare Workers & Pages Supabase

Contact

limwoohyun01@gmail.com GitHub ↗