Senior Expo & Node.js Engineer

We are finalizing LYS GEVITY, a full-stack health, longevity, and fitness mobile app built with TypeScript, Expo, React Native, Node.js, Prisma ORM, Terra API, and Mux Video. The codebase is ~95% complete and stabilized on main. We need a senior engineer to take ownership of the repository, address technical debt, and prepare the app for launch. Key work includes real-device testing on iOS and Android for permission flows, connecting Mux video inventory to production, linking medical claim attestations, and managing end-to-end QA, native builds, and store submissions. This fixed-price project is structured into 3 milestone payments based on device verification and store launch approval.