Catalog
Missions
Pick a Work-Simulation Task. Every mission is graded on all four pillars.
CR-042MediumFix Auth Middleware Token Expiry
Our `verifyToken` middleware silently returns 401 when a token is within its grace window. Harden the check and ship a test.
CR-051HardOptimize Image Pipeline Cold Cache
The first request to any new product image takes 3.2s. Profile the pipeline, identify the bottleneck, and bring cold p95 under 800ms.
CR-037MediumRefactor Checkout State Machine
Checkout is a tangle of booleans. Refactor to an explicit state machine with exhaustive transition tests.
CR-063HardInvestigate Flaky Integration Suite
CI is red on main for ~1 in 10 runs, always on the same integration test. Find the race and fix it.
CR-022EasyAudit Public API for PII Leaks
Our `/users/:id` response started shipping email + phone to anonymous callers. Audit, patch, and add a regression test.
CR-078MediumThrottle Webhook Retry Storm
Our retry logic fires 5 attempts in 2 seconds when a downstream returns 500. Design and ship a reasonable backoff.