Cross-platform App with Authentication

I’m building a mobile application that will run on both iOS and Android, and the very first milestone is to get rock-solid user authentication in place. I’m flexible on the underlying stack—Flutter, React Native or a comparable cross-platform framework—so long as the end result is a clean, maintainable codebase.

Here’s what I need delivered:

• A cross-platform project that compiles and runs on current iOS and Android versions.
• Secure sign-up, sign-in and password-reset flows.
• Session persistence and token refresh handled properly.
• A simple post-login placeholder screen to confirm the flow works end to end.
• Clear README instructions so I can pull the repo, run the project and verify everything with a test account.

Acceptance criteria: I can clone the repository, follow the documented steps, and log in without errors on both platforms.

If you have a track record of implementing authentication flows and follow best practices for security, state management and code organization, I’d love to hear how you’d approach this and how quickly you could turn it around.