A consumer banking app built with React Native + native modules. **Challenge:** The incumbent app was WebView-based and scored 2.1★ on the App Store due to jank and broken biometric flows. **Approach:** Full rewrite with React Native + Reanimated, native Plaid integration, native FaceID / TouchID. **Outcome:** - 4.8★ across 12k reviews - 120k downloads in the first quarter - Crash-free sessions: 99.94%