Question bank

4,310 interview questions, answered.

Reference answers, what the interviewer is really testing, how it is graded, and the follow-ups that come next.

Easy 190Medium 2,498Hard 982
Filters · onDifficulty, topic, company
Clear all

23 questions

  1. 1Design a next word prediction system.MediumSystem design· Meta
  2. 2Design an automated comment moderation system.MediumSystem design· Meta
  3. 3Design the backend of a feature that allows users to download their data from their Facebook account.MediumSystem design· Meta
  4. 4Design a birthday app for Facebook.MediumSystem design· Meta
  5. 5Design a DNS cache.MediumSystem design· Meta
  6. 6Design an evaluation framework for ads ranking.MediumAI MLProduct· Meta
  7. 7Design Facebook email.MediumProductSystem design· Meta
  8. 8Design a system to show the top 10 most frequently listened songs in the last 7 daysMediumSystem design· Meta
  9. 9Design a leaderboard system.MediumSystem design· Meta, Microsoft
  10. 10Design a music streaming service for Facebook.MediumProductSystem design· Meta
  11. 11Design a product for managing parking (not limited to cars).MediumProductSystem design· Meta
  12. 12Design an app to search for therapists.MediumProductSystem design· Meta
  13. 13Design a web crawler.MediumSystem design· Anthropic, Google
  14. 14How would you improve Facebook Marketplace?MediumProductSystem design· Meta
  15. 15What is an API and how does it work?MediumSystem designTechnical· Apple, Meta
  16. 16Design an app for newcomers in a city to find doctors.MediumProductSystem design· Meta
  17. 17Design a solution for borrowing and lending goods among neighbors on Facebook.MediumProductSystem design· Meta
  18. 18Design a streaming service like Netflix.MediumSystem design· Meta, Netflix
  19. 19Design Twitter.MediumSystem design· Freshworks, Meta
  20. 20Explain how microservices work.MediumSystem design· Meta
  21. 21Should Facebook consolidate its messaging applications?MediumProductSystem design· Google, Meta
  22. 22How would you improve Buy and Sell Groups on Facebook?MediumDataProduct· Meta
  23. 23How would you improve Facebook's timeline?MediumProductSystem design· Meta