Sangbuem Choo
Builder at Stealth
Tokyo, Japan
Summary
👤
Senior🎓
Top SchoolSangbuem Choo is a solutions-focused software engineer and builder with nine years of experience delivering client-facing full-stack and AI-powered systems across Japan and globally. He combines hands-on frontend expertise (React/Next.js/TypeScript) with practical AI integration (LLMs, RAG) to ship production workbenches, on-premise call centers, and rapid prototypes that saved clients significant time and cost. Notable wins include a RAG chat for top Japanese firms, a digital transformation that cut documentation time by ~30% across 70+ elderly-care facilities, and a 7-day AI‑CRM integration that reduced meeting-log effort by ~90%. Comfortable bridging English, Korean and Japanese, he frequently leads bilingual discovery workshops and guest lectures on AI and culture, blending technical delivery with stakeholder empathy. He favors automating repetitive work to free humans for creative problem-solving, and has repeatedly converted ambiguous, high‑volume data challenges into practical features under tight timelines.
9 years of coding experience
3 years of employment as a software developer
Computer Science & Business Management, Environment and Information Studies, Computer Science & Business Management, Environment and Information Studies at Keio University Shonan-Fujisawa CampusComputer Science, 3.67, Computer Science, 3.67 at New York UniversityMaster's degree, Master's degree at Keio University Shonan Fujisawa Campus
English, Korean, Japanese
Github Skills (174)
openapi10
validation10
ai10
ollama10
shell10
typescript10
editor9
openai-api9
react-component9
gatsby9
webui9
swift9
json-data9
python9
uikit9
Programming languages (17)
Github contributions (5)
leochoo/leochoo
Jul 2021 - Jan 2026
Contributions:10 pushes, 1 branch in 4 years 6 months
leochoo/react-vocal-journal
Feb 2022 - Jun 2022
React version of Vocal Journal
Contributions:16 PRs, 72 pushes, 3 branches in 4 months
react
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