Food Delivery

Food Delivery with catalogs, availability, pricing, and orders.

Architecture

Data Model

• products (sku PK, name, price)
• orders (order_id PK, user_id, status, total)
• order_items (order_id, sku, qty, price)

APIs

• GET /api/products
• POST /api/orders { items }
• GET /api/orders/:id

Scaling

• Cache catalog
• Shard orders
• Async stock updates

Trade-offs

• Strong order consistency vs throughput
• Inventory reservation vs oversell
• Promo complexity vs performance

Failure Modes & Mitigations

• Payment timeouts → retry
• Stock race → reservation
• Order partial failure → compensation

Observability

• Order success rate
• payment auth rate
• stockout events