Case Studies

E-commerce breaks under real load, especially during flash sales where hundreds of users hit the system at once. MinimalMart was built to solve exactly that.

Inventory ReservationUsed Redis DECR instead of the standard SQL read-then-write pattern. Being an atomic operation by nature, race conditions are impossible regardless of concurrent request volume.

Payment RetryExponential backoff with a dead letter queue for orders that exhaust all retry attempts. No order gets stuck in a limbo state.

Webhook IdempotencyEvery incoming event is checked against a stored event_id with a unique constraint before processing, making duplicate webhook delivery completely safe.

Stack: Next.js · NestJS · PostgreSQL · Redis · Docker