LLD Dojo

Everything in one place

The order book, and everything that leaves this laptop

The handbook opens in the browser and needs no account, no server and nothing installed. The bundles below are what the Dojo's runtime zip does not carry. Three tabs, one URL to remember.

Low-Latency Order Book — Handbook

Seven build rungs with acceptance gates, your twenty-two chapters written out in full, and the tools that show you what the code is really doing. One self-contained file, works offline.

Open the handbook →

How it is meant to be used

Reading produces recognition, not retrieval. So each rung locks the explanation until you commit to an answer — the chapters genuinely will not open first.

1 · GuessAnswer the rung's questions in writing, chapters shut. Badly is fine. Badly is the point.
2 · ReadOnly now do the chapters unlock, and you find out which answers were wrong. That correction is the learning.
3 · BuildThe gates decide whether you understood it or merely recognised it.
4 · Say itTwo minutes out loud, laptop shut, then write the decision entry from memory.

What is inside

7build rungs
22chapters
48gates
24diagrams
5tabs

The five tabs it carries

Start — the loop and your progress. Build ladder — seven rung views, each with gates, a stuck-protocol indexed by symptom, and a two-hour escape hatch. Chapters — one chapter per view, prev/next, with every rung linking straight to the chapters it needs. Tools — free browser tools that show pointers moving, assembly generated, and what memory ordering actually costs on ARM. Setup — repo bootstrap and the decision-log format.

Build it on the Mac, from scratch New repo, personal git identity, and the existing order book treated as a reference of last resort. The point is a project you can defend for twenty minutes under pressure — which only happens if your hands did the typing. The Setup tab has the exact commands.