Design Twitter

Twitter (now X) is a microblogging platform where users post short messages called "tweets" to their followers. Sized here at ~400M daily active users (a round design target with headroom over reported figures) generating hundreds of millions of tweets per day, it's a classic system design interview question that tests your ability to handle massive read-heavy workloads and real-time feed generation.

This walkthrough follows the Interview Framework and focuses on what you'd actually present in a 45-60 minute interview.