Website to Shopping App Conversion

I already run a fully-functional e-commerce website and now want the same shopping experience packaged as native apps on both iOS and Android. The goal is a smooth, branded mobile experience that mirrors my current site’s catalogue and checkout flow while adding the engagement tools mobile users expect.

Core functionality I need implemented:
• User login & registration tied to my existing customer database
• Product search with fast filtering and sorting
• A secure payment gateway (the one used on the website, plus Apple Pay / Google Pay where possible)

To boost retention and sales I also want:
• Push notifications for promotions and order updates
• Wishlist / favourites so shoppers can save items
• Real-time order tracking inside the app
• A lightweight social chat function so customers can ask questions without leaving the app

Design must follow my site’s branding yet feel truly “mobile first.” I’m open to React Native, Flutter or native stacks—as long as the final deliverables include:

1. Source code and project files
2. Compiled builds ready for App Store & Google Play submission
3. Integration documentation showing how the app syncs with my current back-end APIs and payment provider
4. A quick walkthrough video or call once everything is delivered so I can confidently maintain or extend the app later

If this sounds like a challenge you’re comfortable owning end-to-end—from UI/UX to store deployment—let’s talk timelines and the best approach to bring my store to every pocket.