Unity 6 iOS Release Build

I am an experienced Unity developer (Android version already in development) and need a professional iOS/macOS developer.
This is not just a TestFlight build – I need a production-ready Release build submitted for App Store Review.
The game:
Unity 6
Singleplayer
Firebase integration
Mobile Ads integration
No multiplayer backend
Scope of Work
You will:
Build the Unity 6 project for iOS
Fix any iOS-specific issues (plugins, Firebase, Ads, signing, SDK compatibility)
Configure proper Code Signing using my Apple Developer Account
Create a production-ready Release Archive (.xcarchive)
Upload the build to my App Store Connect
Prepare it for App Store Review (production submission)
Support one rejection fix if needed (build-related only)
What I Provide
Unity 6 project (or iOS export if sufficient)
Apple Developer Account access (Developer role only)
Bundle Identifier
App Store listing content (description, keywords, etc.)
Impor...