I’m building a practical utility app that must work flawlessly on both iOS and Android. The core concept is clear, but I need an experienced cross-platform developer to turn it into polished, store-ready binaries. Key requirements are straightforward: secure user authentication, dependable push notifications, and full offline functionality with seamless background sync once a connection returns. Whether you prefer Flutter, React Native, or another modern framework, I’m fine as long as the final product meets Apple App Store and Google Play standards. Clean, well-commented code in a private Git repository is essential. Deliverables • Complete source code, with instructions to build and sign the iOS and Android apps • Internal-testing builds (TestFlight and APK) • A concise README explaining the offline data strategy, push setup, and any third-party services used Acceptance criteria • Users can register, sign in/out, and reset passwords securely • Every critical feature remains usable in Airplane Mode and syncs correctly when online • Push notifications arrive whether the app is foregrounded, backgrounded, or closed • Both store submissions pass initial review without code changes If this aligns with your expertise, please share relevant portfolio links and an estimated timeline so we can move forward quickly.