Location: Seoul, South Korea
  Remote: Yes (remote only)
  Willing to relocate: No
  Available: February 2027
  Technologies: Flutter, Spring Boot/WebFlux, Laravel, React, Vue,
    TypeScript, Node.js, GraphQL, MySQL, Redis, AWS, Cloudflare Workers,
    Docker, Electron
  Résumé/CV: https://sangyun-lee.sellerkit.workers.dev
  Email: [email protected]

13 years building the whole stack: mobile app, web front end, API, and the servers under it.

I am looking for part-time, ongoing work rather than one full-time seat: about 20 hours a week per company, and I can hold two at once. I am free from February 2027, and happy to talk now and line up a start date.

Most recently I shipped a kids news app in Flutter for a Dong-A Ilbo subsidiary, then rebuilt its backend on Spring Boot WebFlux and moved the app across without an app-side rewrite, because the API boundary was GraphQL from the start. Before that: an unattended study-cafe system (Electron kiosk, recurring card billing, door controllers), a healthcare platform on Laravel/React serving clinics, patients and operators, and a Flutter/Firebase chat app with push and in-app purchases.

Part-time works with me because nothing waits on a handoff. I own the app, the API and the server, so a feature goes from spec to release without three people syncing. Payment integrations and "the app runs but the backend needs replacing" are both familiar ground.

I am in KST (UTC+9) and can hold a few hours of European or US-morning overlap.