I want to launch a grocery and prepared-food delivery app that runs smoothly on both iOS and Android. The cornerstone is reliable, map-based real-time tracking so customers can watch their rider approach without refreshing the screen. On top of that, the build needs three customer-facing extras: • Order scheduling – shoppers choose a future delivery slot and the system stores it accurately • Push notifications – instant status updates at every stage, even when the app is closed • Customer reviews – a simple rating/comment flow once an order is completed Clean UX, fast load times, and solid security around payments and personal data are non-negotiable. You’re free to work in Flutter, React Native, or native Swift/Kotlin as long as the end result is a pair of production-ready apps that pass App Store and Google Play review. Source code, API documentation, and test builds should be provided throughout the project so I can follow progress and run QA on my side.