Android E-commerce App Development

I need an Android-only e-commerce app built from the ground up. The core goal is to let users browse products, add them to a cart, and complete secure in-app payments.

Key needs
• Modern Android UI that matches our brand palette (assets provided after hire).
• Product catalogue with search, category filters, and basic inventory sync via a REST API.
• Shopping cart, checkout flow, and integration with at least one popular payment gateway (Midtrans, Xendit, or Stripe—whichever you can set up fastest).
• Secure customer accounts with email or Google sign-in, order history, and push notifications for order status.
• Basic admin endpoints already exist; you’ll connect the app to them and document any additional endpoints you require.
• Clean, well-commented Kotlin code, ready for Play Store submission.

Please include in your reply:
1. A brief outline of your approach and preferred Android architecture (e.g., MVVM with Jetpack libraries).
2. Examples of live Android commerce apps you’ve delivered.
3. Estimated timeline for a working prototype and final release.

I’ll handle store listing assets and copy once the APK is ready; you just focus on the functional, tested app.