Do now
- Set a timer.
- Attempt the problem on Day 1. Do not scroll past the attempt line.
- Then read.
You read this in the browser. No clone. No install. One sitting is 30–40 minutes. Stop at 40 even if you are mid-sentence.
Four doors
Start — This page. Open a day and work. The design log stays in your notes, not on this site.
How to study — Attempt the problem, then read, then say the hour back.
Day 1 — What the interviewer is grading. This is today’s lesson.
Checklist — Days 1–90 on paper. A tick in the browser is not saved.
Days 1–90 are written. Start at Day 1. The curriculum is the map, not today’s lesson.
The log is yours. The template is only a shape. Copy it into your own notes.
Whiteboard figures are SVG on days 1–3 and 8–10, with the other diagrams, after the attempt line. The picture is not the opener. The other days use mermaid you can redraw. Search sits in the corner of the book.
The interview kit is sold separately. It is not required to start, and it is not part of this book. Day 85 shows how it attaches; day 90 can run on the lobby fallback without it.
Optional after day 90: appendices (company quirks, Dynamo / Spanner / Raft). Not a substitute for a mock.