I'm Sangyoon Lee, a full-stack developer in Seoul with 13 years of experience, and I'm available for remote contract work starting now.
A note up front: I don't speak English well. I communicate in writing and use AI translation for every message, so please expect written replies (within 24 hours, weekends included), not calls or video.
What I build and fix
- Admin dashboards and back-office tools (members, orders, settlement, permissions, change history)
- Billing, settlement and payment integrations (PG, recurring payments, kiosk/card terminals)
- Backends for web and mobile apps, plus Flutter apps shipped to iOS and Android
- Stack: Laravel and CodeIgniter, Spring Boot, Node.js/TypeScript, React, Vue, MySQL/PostgreSQL/Redis, AWS, Docker
Things you can check
- I replaced a production app's backend (serverless to Spring Boot WebFlux) without forcing a user app update.
- I built a multi-channel settlement reconciliation engine (Java 17, idempotent reprocessing, rollback).
- I shipped three new services in two months as the only developer, all on schedule.
How I work
Remote only. Scope and acceptance criteria are agreed in a document before I start, progress is written up every week, and I reply within 24 hours, weekends included. Everything stays in writing, so nothing gets lost.
Instead of an interview, the first small task is free
We agree on the scope in writing first (up to about 10 hours of work), and I deliver within a week with a short written update every day. If you like the result, we continue on a paid basis. If not, you've lost nothing. One free task per company.
If you have a backend, admin or integration task that keeps slipping, send me a short description and I'll reply with a plan.
Portfolio: https://cv.namubase.com
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