Backend architecture
PulseCart Infrastructure Lab
A backend architecture case study for checkout, inventory and payments with queues, caching and graceful failure handling.
Primary signal
API design
Core pattern
Reliable flows
Recruiter value
Backend depth
Tech Stack
Node.js Express MongoDB Queues Docker
What it demonstrates
- Checkout API design with idempotency keys to prevent duplicate payment captures.
- Inventory reservation model for high-demand items and concurrent cart activity.
- Retry-safe webhook processor for payment and fulfillment status changes.
- Operational notes covering caching, queues, observability and failure recovery.