Cross-Platform Mobile App Development

I'm seeking an experienced mobile app developer to create a cross-platform app for both iOS and Android.

The app will require the following core functionalities:
- User authentication
- Push notifications
- In-app purchases

Ideal candidates will have:
- Proven experience in Flutter development
- Strong background in implementing secure user authentication and managing push notifications
- Experience with in-app purchase integration
- UI/UX design skills to ensure a seamless user experience

Please share your portfolio and relevant experience.