Step 1 of 14 · Intro

Design a video platform

Upload once, stream to millions at every quality.

How it works

• ›Watch: a nearby edge cache serves video chunks, falling back to the origin.
• ›Upload: the file is stored, then workers convert it to several qualities.

What you'll build

1. The API and the data behind it
2. A system that answers 300 requests a second
3. A CDN, cache and replicas for tens of thousands
4. An upload pipeline with a queue, workers and transcoders
5. Designs that survive a cold cache, a lost server and a lost primary