Senior Full-Stack Mobile Dev — cross-platform health app (frontend + backend, BLE, GDPR)

We're looking for a senior full-stack mobile developer to build a cross-platform health-tracking app (iOS + Android + backend) as a complete product — not an MVP. Scope: single codebase (Flutter or React Native — tell us your choice and why), REST/GraphQL backend on PostgreSQL, ~10 functional modules including blood-pressure/medication logging, read-only caregiver access, configurable alerts, PDF reports, and billing (IAP + Stripe). Full functional spec is in the attached PDF. Must have experience with: Production iOS + Android apps (please link 2–3 you've shipped) BLE / Bluetooth device integration (blood-pressure monitors via aggregator or SDK) Backend, API design, and PostgreSQL Handling sensitive/health data with a GDPR-aware architecture Nice to have: Apple Health / Health Connect, telehealth video integration, prior health/medtech projects. How to apply — please include: 2–3 relevant apps you've built (links / App Store / Play) Your proposed stack, timeline, and price (fixed milestones preferred) A short note on how you'd approach BLE device integration This project is under NDA, and all work is work-for-hire with full IP assigned to the client. Looking forward to your proposal.