Practice: News Feed (Twitter / X timeline)

Users post short messages and follow others; generate a home timeline that is fast to read and tolerates celebrity accounts.

45-minute interview simulation

You will move through 7 stages, each with a time budget. Type your answer as you would say it out loud. The reference answer is hidden until the review. Going over time is allowed, but it is tracked.

Requirements — 5 min
Back-of-envelope estimates — 5 min
API design — 5 min
Data model — 5 min
High-level design — 10 min
Deep dives — 10 min
Trade-offs & wrap-up — 5 min