Multi-Category Quick Commerce App Development

I'm looking for an experienced app developer to create a quick commerce app covering grocery, food, and pharmacy deliveries. The app should be available on both iOS and Android platforms.

Core features are essential:
- User account creation and login
- Order tracking
- Payment integration

Ideal candidates should have:
- Proven experience in developing multi-category delivery apps
- Strong knowledge in both iOS and Android platforms
- Expertise in backend systems for order tracking and payment integration
- Familiarity with UX/UI design for a seamless user experience

Please include examples of similar work in your proposals.