Cross-Platform Productivity Mobile App

I need a complete mobile application built that helps users boost productivity. The core idea is a straightforward utility app, released simultaneously on both iOS and Android.

Key expectations
• Build native or cross-platform code that runs smoothly on iOS and Android devices.
• Design a clean, intuitive interface focused on quick task completion and minimal learning curve.
• Implement essential productivity features—think to-do management, reminders, or quick-note capture—so the user can organize activities on the go.
• Set up secure user authentication and a lightweight cloud-based database so data stays synchronized across devices.
• Provide basic analytics hooks so I can track user engagement in the future.

Deliverables
1. Source code and compiled builds for iOS (ready for App Store TestFlight) and Android (APK or AAB ready for Google Play testing).
2. Installation and setup documentation, including any backend configuration.
3. A brief hand-off session or screencast that walks through feature flow, code structure, and build steps.

If you have experience launching productivity or utility apps on both platforms, I’m especially interested in seeing examples.