ARCHITECTURE TRAINER

Draw it.
Break it.
Fix it.

A canvas for system design that checks your work.

START DRAWING →My designs
The Loadville CourierNo. 2 · Thursday, 12 November 2026Life in Loadville: everyone called back at onceComic: Everyone called back at onceRead the paper →
A baker in a flour-dusted apron staring at an old computer with a red error screen, a queue of neighbours outsideON CALL · 001 · Mon 9 NovJohn's bakeryEvery Saturday at 8:00, this bakery's website dies.PLAY →
The Loadville Courier · No. 2 — Comic: Everyone called back at once →

WHY THIS ONE

  • WebLBmajor · no health checkApp

    It reads your design

    Claude checks the drawing against your requirements, scores it on five axes and pins every finding to the box it is about.

  • 9excellent
    6shaky

    Fewer boxes win

    Anything the requirements did not ask for counts against you. Five boxes that do the job beat fifteen.

  • Pull the plug

    Press Play, switch off a server, a zone or a region, and watch which requests fail.

  • Workertimeout 2sVendorlatency 3–7 min
    timeout under latency

    Numbers, not vibes

    Put timeouts, retries and rate limits on the connections. The canvas flags a timeout shorter than the call it waits for — instantly, before any review.

  • CacheQueueSQL database

    Mechanisms, not vendors

    A cache, not Redis. You are judged on how the system works, not on which brands you know.

  • 8solid

    Free, no account

    Short reviews are free. The full one runs on your own Anthropic key — a few cents each, no subscription.

START DRAWING →