Multi-Platform Quick Commerce Build

I’m rolling out a quick-commerce service and need a single code-base powering native iOS and Android apps together with a fully responsive web storefront. The site must behave like a true e-commerce platform—searchable catalogue, cart, secure checkout and live order status—while the mobile apps mirror the same experience for shoppers on the go.

My priorities are:

• One shared backend so inventory changes and price updates surface instantly across iOS, Android and Web.
• Fast, intuitive user journeys from product discovery to payment.
• A modular architecture that can absorb new features—real-time logistics, one-tap re-orders, loyalty, etc.—without rewrites.

Deliverables
1. Wireframes and polished UI for phone, tablet and desktop breakpoints.
2. Production-ready builds: iOS (Swift/Flutter), Android (Kotlin/Flutter) and a JavaScript-based web front end.
3. Cloud-hosted backend with REST/GraphQL API, secure auth, payment gateway integration and admin dashboard.
4. Automated testing, performance tuning, app-store submissions and concise technical documentation.

Clean, well-commented code and clear hand-over files are essential. If you have shipped similar on-demand or quick-commerce solutions, include live links or demo credentials so I can evaluate your approach quickly.