We built a full-stack grocery delivery app with React Native for iOS and Android, powered by a MERN backend (MongoDB, Express, React admin, Node.js). Shoppers can browse stores, add items, pick delivery slots, approve substitutions, and track riders in real time—while operations teams manage inventory, picking, and deliveries from a browser-based control panel.
The mobile client uses an advanced React Native architecture with feature modules, offline-ready carts, and smooth micro-interactions. Behind the scenes, the MERN stack handles multi-store catalogs, per-location stock, dynamic pricing, promo campaigns, and event-driven updates for order status and rider location via WebSockets.
The brand moved from ad-hoc phone orders to a structured, trackable on-demand grocery experience, with higher AOV and fewer failed deliveries.
Before the app, the grocery chain struggled with:
We delivered a React Native + MERN delivery platform:
The grocery app now:
The platform uses a modern React Native client talking to a MERN backend, with event-driven updates for orders, stock, and delivery progress.
Carts, browsing history, and addresses cached locally so users can build orders even on unstable networks, with sync on reconnect.
Pickers propose substitutes from their interface; customers approve or reject via in-app notifications before packing completes.
Slot availability based on store capacity, picker limits, and rider coverage, not just static time windows.
Automated builds, environment-based configs, and feature flags to roll out new flows (e.g., dark stores, express delivery) safely.
The stack is containerized with Docker, with staging/production environments, seeded data for QA, and scripted migrations for catalog and pricing changes.
