Context
Healthcare platform for the German market connecting patients, care providers, and administrators — mobile app, web admin, and backend services, with security and encrypted media exchange built to healthcare-compliance requirements.
My role
- Mobile lead: architecture, code review, sprint planning, and monthly releases.
- Hands-on full-stack: features spanning mobile (React Native New Architecture), web (Next.js), and backend (NestJS, NATS, PostgreSQL).
Technical decisions
- Startup caching, lazy loading, and deferred heavy initialization to handle slow cold start on real devices.
- Custom native module for chunked, encrypted upload/download instead of a default transfer library.
Outcome
- Cold start cut from over 10 seconds to 1–2 seconds (~85% faster).
- 90MB media file transfer cut from ~5 minutes to ~10 seconds (30× faster).