Grocery Stationery Shopping App Development

I need a fully functional mobile application that lets customers shop for groceries and stationery on both Android and iOS. Core experience must feel fast and intuitive: users open the app, find what they want quickly, add items to a cart, and check out without friction.

Key requirements
• Platforms: native (or reliably cross-platform) builds for Android and iOS released to Google Play and the App Store.
• Sign-in methods: classic email + password as well as social login (Google, Apple, Facebook).
• Features: smart product search with filters, a smooth shopping cart and checkout flow, and real-time order tracking visible inside the app.

Deliverables I expect
1. Source code and compiled builds for both platforms.
2. Simple documentation covering project setup, major components, and how to add products.
3. A short hand-off call or video walkthrough so I can test and publish confidently.

If you have a preferred stack—whether Kotlin / Swift, Flutter, or React Native—let me know how it will meet these goals, along with any past work that shows you can deliver polished consumer apps.