Fintech App for iOS and Android

I’m looking for experienced mobile talent to turn my fintech concept into a polished application that works seamlessly on both iOS and Android. This project is mobile-first from day one, and every screen, workflow, and API call should feel equally at home on an iPhone or an Android device.

The app’s core purpose is fintech, so security, data integrity, and a clean user experience will guide every technical and design decision we make together. I already have a rough feature outline and brand assets; once we start, I’ll share those so we can lock down the final scope.

Here’s what I need from you:
• A single, maintainable codebase that compiles to native iOS and Android binaries
• Help selecting the most appropriate stack (Swift/Kotlin, Flutter, React Native, or another you can justify)
• Source code, documented setup scripts, and clear build instructions
• Test builds delivered through TestFlight and a comparable Android channel, ready for App Store and Google Play submission

Acceptance criteria:
• Both apps install and run without crashes on current OS versions
• All agreed-upon fintech features meet the supplied UI/UX mocks
• Passing results on standard security checks and store compliance reviews
• Clean, readable code pushed to a private repository I control

If your background includes shipping secure mobile apps—especially in the finance space—let’s talk timelines and milestones so we can move quickly toward launch.