Junmin Lee

Sole mobile engineer owning the full product end-to-end, from architecture and UI to native integrations, CI, and store releases on iOS and Android. Implemented client-side token validation to prevent cross-account data exposure, designed a 2-phase commit pattern for serialized token refresh to avoid race conditions, built a real-time QR-to-result SSE pipeline, created native platform channels for unified permission handling, integrated Kakao + Apple social logins and PortOne (Iamport) for identity verification, and added FCM push support with topic-based segmentation. Participated in product planning and iterative post-release improvements guided by Crashlytics signals.

Sole mobile engineer responsible for end-to-end Flutter app development, architecture, UI, native integrations, CI, and store releases for iOS and Android. Implemented client-side validation to prevent cross-account data exposure, serialized token refresh to avoid race conditions, integrated Kakao and Apple social login, PortOne verification, SSE-based real-time results pipeline, and remote-config-driven updates. Set up push notifications and crash logging; contributed to product planning and ongoing maintenance.

Owned the full healthcare app product: delivered Flutter frontend, Node.js REST API (MVP), and a JavaScript admin dashboard; designed backend structure and MySQL schema; coordinated with external vendors and freelancers; contributed to policy documentation and wireframes.