Rebuild Source for Mobile App

I released a consumer-facing app on both iOS and Android some time ago but, unfortunately, the original source code is no longer available. All I can provide today is the signed iOS IPA. I need someone who can either decompile that binary to recover as much logic /UI as possible or, if that proves impractical, rewrite the application so that it behaves exactly the same on both platforms. Core behaviour to replicate • Secure user authentication (current flow uses email + password). • Push notifications that mirror the existing timing and payload structure. What I will supply – The live IPA, screenshots of every screen, and a short video walkthrough so you can observe each interaction path. – Existing branding assets, copy and any server-side API documentation still on hand. What I expect back 1. Readable, well-commented source projects for iOS (Swift or Objective-C) and Android (Kotlin or Java; a React Native or Flutter build is fine if it speeds things up while keeping parity). 2. New build artifacts ready for TestFlight and Google Play internal testing. 3. A brief setup guide covering dependencies, signing, and how to trigger push notifications from our back-end. 4. Confirmation that authentication and push alerts work on at least one physical device per platform. I’m happy to walk through the current app on a call and answer technical questions quickly so you can gauge the effort involved. If you have proven experience salvaging or recreating legacy apps, let’s set up a chat and get this moving.