Pet App Flutter Build

I already have a complete Figma layout for a Pet-Management application and now need the screens turned into a fully working iOS and Android build. You may work in Flutter or React Native—the choice is yours as long as the final binaries pass App Store and Play Store review.

Scope
• Connect every screen to my existing custom backend; the API is REST-based and fully documented.
• Implement pet profiles and automated reminders for vet visits with push notifications.
• Add a payment gateway integration (Stripe SDK is preferred, but I’m open if you have a faster alternative).
• Wire up standard mobile essentials—secure auth, error handling, offline awareness, deep links, and analytics.
• Package, sign and submit the release builds to both stores under my developer accounts.

Deliverables
1. Source code repository with clean commits.
2. Two release-ready builds (APK/AAB and IPA).
3. Store listings prepared and submitted, including screenshots pulled from the final build.
4. Short hand-off document explaining environment setup, build commands, and where key logic lives.

Acceptance
The app must install cleanly on iOS 15+ and Android 10+, display no critical crashes on Firebase Crashlytics, and successfully trigger test vet-visit reminders. Payment flow should complete a sandbox transaction end-to-end.

Timeline is tight—ideally one week, with an optional second week for polish once the stores approve. I’m flexible on price for proven expertise; please share a similar live app and note whether you lean toward Flutter or React Native so we can jump right in.