Flutter Developer for Theme Customization & Payment Integration

I'm looking to hire an experienced Flutter developer for a freelance project involving customization of an existing Flutter theme and setting up Tranzia payment gateway integration. The app will be deployed on both iOS and Android, so expertise in cross-platform development, especially iOS deployment, is essential.

Project Requirements:
Flutter Theme Customization

Modify UI/UX elements based on our branding.

Implement feature adjustments in the existing codebase.

Ensure responsive design across devices.

Payment Integration

Integrate Tranzia payment gateway seamlessly.

Ensure secure and smooth transaction flow.

Test payment functionality in both sandbox and live environments.

Platform Support

Ensure full functionality on both iOS and Android.

Handle iOS-specific configurations and permissions (especially for App Store compliance).

Required Skills:
Proven experience with Flutter & Dart

Deep understanding of mobile app development lifecycle

Experience with iOS deployment & App Store guidelines

Integration of third-party APIs (especially payment gateways)

Clean and maintainable coding practices

Nice to Have:
Experience working with Tranzia or similar payment systems

Knowledge of Firebase or backend integration (optional)

Deliverables:
Updated & customized Flutter app (iOS & Android ready)

Fully integrated Tranzia payment solution

Source code and setup documentation

Assistance in app deployment if needed