Production Checkout Service

Design and build an idempotent checkout + payments service with retries and webhooks.

By Demo Academy

The brief

Design and build an idempotent checkout + payments service with retries and webhooks. The brief is deliberately incomplete — you make and justify the tradeoffs.

Deliberately ambiguous — you make and justify the tradeoffs. Your work is checked against a held-out evaluation you can't see in advance.

Milestones & mentor checkpoints

How you're graded