Chanjoong (CJ) Kim

idea to shipped, on a short clock.

• shipping 26 mini-apps in 30 days as an official partner on Toss, Korea’s fintech super-app, now 28 live. ~19K combined users. (top 3: 5.7K / 4.8K / 4.2K).’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. covered by The Chosun Ilbo, The JoongAng, and The Hankyoreh.’26
• reflect, a session-level metacognition harness for Claude Code. ~96% L1 cache hit-rate, ≤50 ms hook exit, ~$0.01 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
• 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
• neverboringnow, my solo studio. an AI audience-research tool that reports calibrated uncertainty per question (Wilson + Rubin + ICC), not just a single number.’26

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

currently in the KMU Global PBL Program, Irvine, learning from engineers at OpenAI, AWS, and Blizzard.