Step 1 of 12 · Intro

Design a collaborative editor

Many people typing in one document, and nobody's edit lost.

How it works

• ›Type: each edit is sent over an open connection.
• ›Merge: edits are ordered in a log and applied to the document.

What you'll build

1. The API and the data behind it
2. Realtime gateways for open connections
3. A log (stream) of edits with workers that apply them
4. Shards for write-heavy scale
5. A design that survives a cold cache and a lost gateway