Design Reddit
Medium · System Design · about 45 minutes
Asked at Reddit, Meta, X (Twitter), Pinterest, Snap, Zillow.
Design a community discussion site like Reddit for ~100M daily users. Users post in communities, comment in deeply nested threads, and upvote or downvote posts and comments (~100M votes per day, far more on viral posts). Community and home pages are ranked by hot, new and top, and must load in under 200ms.