Firebase Web App Development

I'm seeking an experienced developer to create a Firebase-backed web application. The app will utilize Firebase Authentication (email/password), Firestore for database needs, and Cloud Storage. Additionally, I need Android and iOS setup, as well as payment gateway integration.

Key Requirements:
- Implement Firebase Authentication (email/password)
- Set up Firestore database and Cloud Storage
- Configure Android & iOS app setups
- Integrate payment gateway

Ideal Skills and Experience:
- Proficiency in Firebase services
- Strong background in web, Android, and iOS development
- Experience with payment gateway integration
- Previous work in similar projects, showcasing relevant experience