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Report abuseFrontend engineer in Seoul, working on real-time, AI-facing interfaces — and on the tooling and writing that make them usable by other people.
Currently at AhnLab, on an EDR security platform. I build the interface for an AI threat-investigation agent: streaming agent reasoning to analysts over Server-Sent Events using the AG-UI protocol, and shipping product modules independently through Module Federation. Alongside that I automate the parts of engineering nobody enjoys — LLM-assisted code review wired through n8n, and architecture diagrams generated as editable draw.io XML rather than dead PNGs.
mcp-schema-census — your MCP server is valid MCP and still gets a 400 from the model provider. This tells you why, at which JSON pointer, quoting the sentence the rejection rests on. Backed by a public dataset of 617 servers and 14,804 real tool schemas. Building it surfaced a bug in the official Anthropic Python SDK, which I reported and fixed upstream (#1876 · #1877).
Debugging Arena — frontend accessibility failures turned into playable debugging challenges. A runtime evaluator checks the rendered dialog contract while Playwright verifies that same contract independently, so the exercise cannot quietly grade itself. Built with Codex and GPT-5.6 during OpenAI Build Week. Live demo · Demo video · Devpost
Portfolio — case studies with the reasoning behind each system, not just what shipped.
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I Was Wrong About MCP Schemas — Here's What 617 Servers Actually Show — 2026-08-28 An LLM in the Code Review Loop: The Parts That Aren't the Model — 2026-08-10 Streaming to the Browser: SSE for Telemetry and for Agents — 2026-07-13 Module Federation in Production: What Actually Changed — 2026-06-15 Next.JS 변경된 내용이 바로 반영이 안되는 문제 발생 해결 — 2025-04-21 More at cmun2.inblog.io — 35+ posts in Korean on micro-frontends, SSE and hydration, CI/CD and testing practice, plus an English series. Each one starts from something that broke in production rather than from documentation. |
PR openai/openai-node#2512 fix(zod): keep every declared tuple position — 2026-08-28 PR openai/openai-agents-js#1763 fix(realtime): keep conversation order when updateHistory corrects or inserts an item — 2026-08-27 PR cmun2/unfaked#1 Let --json-file create the directory it was given — 2026-08-26 |
AI & real-time — LLM application development · agent event streams (AG-UI) · Server-Sent Events · Model Context Protocol · Codex · Claude Code · n8n
Languages & frameworks — TypeScript · JavaScript · Python · React · Next.js · Vue · Nuxt · Node.js
Platform & quality — Module Federation · micro-frontends · design systems (npm) · Playwright · Vitest · CI/CD
Before frontend I did machine-learning research at CHANGlab, Seoul National University — nanopore RNA sequencing data, FASTQ/BAM/SAM pipelines, and distribution analysis over pandas. It is why schema and data-shape bugs are the ones I tend to notice first.
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