Cross-Platform Flutter E-commerce App Development

I need a skilled Flutter developer to create an e-commerce app for both Android and iOS platforms. The app should include:

Essential Features:
- User Login/Signup
- Product Catalog
- Payment Gateway
- Wallet
- Delivery Status

Additional Features:
- Order Tracking
- Push Notifications
- Chat Support

Ideal Skills and Experience:
- Proven experience in developing Flutter applications
- Strong knowledge of integrating payment gateways
- Experience with user authentication and real-time chat features
- Ability to implement push notifications and order tracking systems
- Familiarity with e-commerce app development

Please provide a portfolio with similar projects and an estimated timeline for completion. Looking forward to your proposals!