System Design
Shape a path, then watch traffic move through it. A cache is a decision, not a sticker.
Blueprint
Build it.
Break it.
Understand why.
Engineering Lab is a sandbox inside the game. You draw an architecture, run traffic, and read what the simulation complains about.
ClientAPIDatabase
Ready
One path. No queue, no cache.
Tracks
Six tracks. They are scenarios, not courses, and they do not end in a certificate. The public alpha includes one sample from System Design, Distributed Systems, and AI Engineering, plus a starter Sandbox of the ordinary pieces: client, load balancer, API, queue, worker, cache, database.
Distributed Systems
Retries, duplicates, ordering, and the charge that may have already happened.
Backend & API Design
How a request should behave. Not how to spell JSON.
Cloud Architecture
Scale, regions, and rollouts, without a vendor logo quiz.
Production Engineering
Alerts, deploys, and the difference between a graph and a customer.
AI Engineering
Agents, retrieval, tools, cost, and evals. Still just software.