Cross-Platform E-Commerce App Development

I need a complete iOS and Android application that lets customers buy physical products straight from their phones. The shopping flow should feel fast and modern: users browse items, add them to cart, check out with a card, mobile wallet, or—when they prefer—submit a bank-transfer slip for manual confirmation. After purchase they must be able to follow every parcel in real time through in-app delivery tracking and get push notifications as the order status changes.

Key customer functions
• Browse products and place orders
• Track deliveries and receive order updates
• Save favourites and leave product reviews

Accepted payment options
• Card and mobile wallet gateways (Stripe, Apple Pay, Google Pay, etc.)
• Bank transfer with proof-of-payment upload and an admin approval flow

Clean, intuitive UI is critical, and the codebase should be a single source (Flutter, React Native, or a similar framework) so future updates roll out simultaneously on both platforms. Please include basic analytics hooks, error logging, and a lightweight admin panel or API endpoints for catalog, inventory, and order management—feel free to propose an efficient stack.

Deliverables
1. Source code for iOS and Android builds
2. Tested, production-ready app bundles uploaded to TestFlight and Google Play Console (internal track)
3. Brief developer documentation and hand-off session

I value clear milestones and regular progress demos. If you have launched similar retail apps that handled physical fulfilment, showcase them in your bid so I can gauge fit quickly.