React Native / Expo Developer Needed to Fix & Finish Existing App

We have a React Native (Expo) app that is about 70–80% built. The UI is mostly finished and the design is approved, but the app is not production ready and needs to be completed, connected, and launched. Current state: * Frontend built with React Native + Expo (TypeScript) * Working backend API with Node.js + PostgreSQL * Mock data used in several screens that must be replaced with the real API * Auth, payments, and notifications are partially wired The work includes: * Replacing mock data with live API responses * Fixing bugs and edge cases across the app * Implementing authentication with token refresh and session persistence * Integrating payments (Stripe) and push notifications * Handling loading, empty, error, and offline states * Testing on iOS and Android devices * Setting up EAS builds and deployment * Preparing for App Store / Google Play submission * Documenting the codebase and build/release steps Stack: React Native, Expo, TypeScript, Node.js, PostgreSQL, Supabase, Stripe, Firebase (FCM). We want a developer who: * Can take over an existing codebase without rewriting it * Understands React, TypeScript, and API integration * Has completed or shipped a React Native app * Documents their work and communicates clearly Please share: * React Native apps you've completed or fixed * Your experience with Expo and EAS builds * Your estimate and timeline