Capstone: A Full Mock Interview

1. The Question

“Design a mobile social app with a feed, comments, and direct chat, and explain how it recovers from failures.”

This teaching example connects requirements, architecture, recovery, and a late change. It is not a transcript of a real company interview or a guaranteed hiring-level answer. Keep the dialogue as a check on reasoning rather than a script to memorize.

Try the complete question aloud for 45 minutes before reading the walkthrough.