Develop iOS and Android App

I’m ready to get a fully-featured mobile application live on both the Apple App Store and Google Play. The essentials are straightforward:

• Native or cross-platform code is fine—as long as the same codebase reliably publishes to iOS and Android. If you prefer Swift/Kotlin, React Native, Flutter, or another modern framework, let me know which you’d choose and why.
• Secure user authentication is mandatory. I’ll need email/password login at a minimum; social sign-ins or other best-practice flows are welcome if they streamline the user experience and strengthen security.
• I’m still finalising the feature list, so an iterative workflow with regular test builds and clear communication will be important. Help me shape the backlog, suggest smart architecture decisions, and keep the project future-proof.

Deliverables I expect from you:
1. Source code in a shared repository.
2. Two production-ready builds approved by Apple and Google (or clear hand-off instructions for store submission).
3. Basic documentation covering project setup, environment variables, and the authentication flow.

If you have live examples of apps that use secure login and run on both platforms, share them so I can gauge code quality and UX. Let’s discuss timelines and the smartest path to get this app into users’ hands.