Chanjoong (CJ) Kim

idea to shipped, on a short clock.

• neverboringnow, my app studio and an official partner on Apps in Toss, the mini-app platform inside Toss, Korea’s fintech super-app: shipped 50 live mini-apps, 18 of them AI apps. top 3 by cumulative daily actives: 6,870 / 6,807 / 4,932 (as of Aug 28, 2026).’26
• Atlas, turns any public GitHub repo into a one-page city map: files as buildings, imports as roads, laid out by a 4-agent pipeline. at the IBM Bob hackathon: 5,628 builders → 1,672 teams → 503 projects → 2nd place. since grown into atlascity.dev, an isometric city with two themes. covered by The Chosun Ilbo, The JoongAng, and The Hankyoreh.’26
• reflect, a session-level metacognition harness for Claude Code. 95.9% L1 cache hit-rate, ≤50 ms hook exit, $0.0089 per warm reflection. picked into Anthropic’s Built with Opus 4.7 hackathon: 1 of 500 from 20,000+ applicants. MIT-licensed on npm.’26
• efaimo, audits what you feed your agent: token cost and quality checks for MCP servers and Agent Skills. one 8-server loadout weighed in at 42,959 tokens across 113 tools before the first prompt. Apache-2.0 on npm.’26
• Oneline, type a sentence, get a working tool on your phone in ~1 min. three parallel agents behind a 3-layer judge. built solo at the Google I/O hackathon.’26

Chanjoong Kim (CJ · 김찬중) is an AI engineer and Kookmin University undergraduate working on LLM agents, multi-agent systems, and efficient ML.

march to july 2026, built projects on the KMU Global PBL Program in Irvine, California, learning from engineers at OpenAI, AWS, and Blizzard.