Every course is an instance of the loop senior engineers run on autopilot. Ten moves, each one visible, each one ending in something a reviewer can inspect.

Turn a messy stake into a precise, falsifiable question. Most engineers debug the wrong problem beautifully — framing is the skill that stops that.
Choose where to look first: cheapest disproof wins. Two paths get ruled out on paper before you touch anything.
Draw the system with directions, owners, and defended omissions. The failure becomes a location, not a vibe.
Commit in writing: options, costs, and the constraint that forced your hand. A memo, not a hunch.
A concrete check a skeptic can run. The starter fails; your fix passes; the output can't be faked.
Try this move live — free, no account →Your artifact is read the way a staff engineer reads it — your score is capped by the weakest claim.
Broken cases are the curriculum. One repair lifts the cap — and teaches more than ten passing runs.
Recall prompts arrive on the forgetting curve's schedule, not yours. Six minutes, then back to work.
The same move, applied in a new domain. That's the moment knowledge becomes judgment.
The artifact joins your ledger: claim, artifact, verdict. Shareable, verifiable, yours.