Zepto Clone Architecture – APIs & Real-Time Delivery Logic

High-level architecture:

• Microservices-based backend for independent scaling of order, inventory, and delivery modules.

• Separate services for customer app, vendor dashboard, and delivery rider app.

• Load-balanced API gateway to handle high concurrent order volume.
  Key APIs you'll need:

• Inventory Sync API: real-time stock updates across dark stores.

• Order Management API: handles order creation, status updates, cancellations.

• Payment Gateway API: supports UPI, cards, wallets with retry logic.

• Geolocation API: for live tracking and delivery radius validation.

• Notification API: push/SMS alerts for order status changes.
  Real-time delivery logic:

• WebSocket connections for live rider location updates.

• Rider allocation algorithm based on proximity, current load, and delivery zone.

• Dynamic ETA calculation using distance + traffic data + rider speed averages.

• Auto-reassignment logic if a rider is delayed or unavailable.
  Database considerations:

• Use a combination of relational DB (orders, users) and NoSQL (real-time inventory, location logs) for performance.

• Implement caching (Redis) for frequently accessed data like product catalogs.
  Scalability tips:

• Horizontal scaling for order and inventory services during peak hours.

• Queue-based processing (Kafka/RabbitMQ) for order events to avoid bottlenecks.

• CDN for static assets to reduce app load time.
  Security essentials:

• Token-based authentication (JWT) for all API calls.

• Rate limiting to prevent abuse during flash sales.

• Encrypted payment data handling, PCI-DSS compliance.
  Conclusion: Architecting this from scratch is a solid learning project, but for production-ready deployment, a pre-built solution can save significant dev time. This Zepto clone script comes with much of this architecture already implemented, which can be a useful reference or starting base for developers building in this space.