Senior Full-Stack Engineer Needed: Reliability and 14,000-User Scale Verification

I’m looking for one senior engineer based in India to evaluate and strengthen an existing production application. The goal is to verify that my IOS mobile reflection App Oghere is stable and the application’s architecture and critical workflows can reliably support 14,000 registered users. This is a reliability and scalability engagement, not a feature-development project. Relevant experience: React Native/Expo and TypeScript Supabase/PostgreSQL or an equivalent managed backend Database indexing, pagination and query analysis Component and integration testing Load testing with k6, Artillery or an equivalent tool Mobile purchases, restoration and entitlement handling Offline behavior, retries and idempotent writes Required deliverables: Review the architecture, data model and critical user flows. Create realistic test data representing 14,000 accounts and users with both small and large histories. Test approximately 250 concurrent active users and a short 500-user burst. Identify slow queries, missing indexes, unbounded reads, unsafe retries, duplicate-write risks and scaling limits. Add automated tests for the highest-risk critical flows. Fix the most serious findings within the agreed time budget. Submit all changes through a pull request. Deliver a final report containing: Findings ranked by severity Load-test configuration and results Before-and-after measurements Estimated safe operating range Known limits and remaining risks Recommended monitoring and alerts Backend or third-party plan limits that could affect 14,000 users Acceptance criteria: Test results are reproducible from documented commands. No unexplained failures or data corruption during the agreed load test. Critical writes are protected against duplication and interruption. Large datasets use appropriate indexes and pagination.