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Timed mock · System Design
45 minutes, split the way the real round is. Answer first, then compare.
The interviewer says
Design the news feed feature for Twitter. When a user opens the app, they should see a feed of tweets from accounts they follow, ranked by recency. Assume 500M daily active users, each with an average of 300 follows.
Work on paper or in the boxes below. Write your answer first; the guide's version only appears when you ask for it. Nothing you write leaves this browser.