Stripe Connect Custom + FlutterFlow/Flutter Expert Needed for Final Launch Phase

I'm looking for an experienced developer to help finalise and stabilise my app before launch. The app was originally built in FlutterFlow, with some custom Flutter, Firebase/Firestore, and Node.js/Vercel backend work. Payments use Stripe Connect Custom. We're in the final testing phase and need someone who can review the entire setup, identify issues, fix them properly, and ensure everything is production-ready. Key Tasks Review and fix Stripe Connect Custom onboarding and payout setup Resolve connected account capability issues (transfers, payouts, etc.) Fix payment link / checkout session creation for all users Verify end-to-end payment flow for organisers and participants Confirm Firestore updates are working correctly Verify payment success/cancel redirects and status pages Link Terms of Service and Privacy Policy pages correctly Test and validate the complete launch-ready flow Requirements Proven experience with Stripe Connect Custom Strong FlutterFlow and Flutter experience Experience with Firebase/Firestore and Node.js Excellent English communication skills Ability to explain issues clearly and provide regular updates Available for ongoing work after launch if we're a good fit Important Please only apply if you have genuine Stripe Connect Custom experience. This is not a standard Stripe Checkout integration. To Be Considered, Please Answer The Following Describe a Stripe Connect Custom project you have personally worked on. Have you worked with destination charges, connected accounts, transfers, and onboarding? Please provide an example. Have you worked on a project that started in FlutterFlow and later moved to Flutter? How would you investigate an issue where one organiser can create payment links successfully, but another organiser receives a Stripe error relating to missing transfer capabilities on a connected account? The app is very close to launch, so I'm looking for someone who can jump in quickly and help get it across the finish line. There will be ongoing work for the right person.