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I need an experienced developer to turn my concept into a fully functional mobile application. The focus is strictly development-related—the UI designs will either be supplied later or refined together once the core build is stable, but my immediate priority is getting the app itself working smoothly on both iOS and Android.

Here’s what I’m aiming for:
• A clean, well-structured codebase (Swift / Kotlin or a cross-platform framework such as Flutter or React Native—open to your recommendation).
• Core features implemented exactly as documented in the user-flow I’ll share after kickoff.
• Secure user authentication, basic in-app data storage, and API integration with my existing back-end.
• Source code pushed to a private Git repo with meaningful commit messages so I can follow progress.
• A test build delivered through TestFlight / Google Play Console for hands-on feedback, followed by a polished release build.

Acceptance criteria:
– The app compiles without errors on the latest stable versions of Xcode and Android Studio (or equivalent cross-platform toolchain).
– All documented screens and endpoints load and behave as described in the spec.
– No critical crashes or blocking bugs during a two-day QA pass I’ll perform.

If you’re comfortable owning end-to-end mobile app development and can communicate clearly along the way, let’s get started.