React Native / Expo Developer — RevenueCat Integration & Production Build

I have a fully functional React Native / Expo app ready for production. The UI, features, and business logic are complete. I need a senior developer for a focused, fixed-price engagement. What I need: • RevenueCat in-app subscription integration (two subscription products, monthly and annual) • Replace existing placeholder purchase functions with real RevenueCat SDK • EAS production builds for Android and iOS • Google Play and App Store submission support • Sandbox testing of purchase and restore flows before delivery Note: The Android app is already built and submitted to Google Play, but it currently uses placeholder purchase logic. This needs to be replaced with the real RevenueCat integration and resubmitted alongside the new iOS build — the scope covers both platforms, not just iOS. Fixed price only. Expert level. Proposals without answers to all four questions will not be considered. Full app details, architecture, and business context shared only after contract documents are signed.