Polish & Publish iOS App- its a prototype- i want to clean up for launch

I have an iOS prototype written entirely in SwiftUI that’s almost ready for prime time, but a few pain-points are holding it back from the App Store. Right now I’m seeing:

i made it in openai-codex-

i need someone look at the prototype i made, make sure no bugs, all smooth, works well and launch it in the app store - i also need the code from them and access in order to maintain it myself - make sure its all working well efficiently and clean. Launch in app store. then give me code and all for it to maintain myself. Also want someone who can do it in one chunk and happy pay the one off. not paying hourly or extras.

• Crashes in several flows
• Performance lags on older devices
• UI/UX problems that make some screens feel rough

Your mission is to hunt those issues down, smooth every interaction, and walk the build all the way through App Store review.

Scope of work
• Debug and eliminate all runtime crashes
• Profile and optimise code so animations and network calls stay fluid on iPhone 8 and up
• Refine layouts, spacing, and gestures so the interface feels native and consistent with Apple HIG
• Prepare the final release package—App Store screenshots, metadata, provisioning, TestFlight build, and successful submission

Acceptance criteria
1. Crash-free build after a full QA pass
2. Average frame rate ≥60 fps on target devices running iOS 17
3. No layout breaks or clipping in portrait or landscape
4. App approved by Apple and live in the store

You’ll receive the existing Xcode project, access to the current TestFlight build, and a short list of known edge-cases. Let’s get this polished, performant and published.