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

123 questions

  1. 25Design a product for managing parking (not limited to cars).MediumProductSystem design· Meta
  2. 26How would you design a Pseudo Random Number Generator (PRNG)?MediumSystem design· Workday
  3. 27Design a rate limiter.MediumSystem design· Amazon, Google
  4. 28Design a rate limiter for a microservices API.MediumSystem design· DocuSign
  5. 29How would you design a relational schema for a calendar application?MediumSystem designTechnical· Better.com
  6. 30Design Robinhood.MediumSystem design· Uber
  7. 31Design a smart refrigerator.MediumProductSystem design· Google
  8. 32Design a system to deny services to requests from banned IPs, as per information provided by security.gov.x.MediumSystem design· Google
  9. 33Design a system to log messages in orderMediumSystem design· Google, Microsoft
  10. 34Design a system capable of identifying ships that deviate from their course using a dataset that tracks ship positions, recorded as tuples containing (ship_ID, x, y, z, timestamp), with irregular timestamp intervals.MediumSystem design· SAP
  11. 35Design an app to search for therapists.MediumProductSystem design· Meta
  12. 36How would you design a three-tier architecture?MediumSystem design· Amazon
  13. 37Design a timer system.MediumProductSystem design· Google
  14. 38Design a travel app experience for Meta.MediumProductSystem design· LinkedIn
  15. 39Design a truck tracking system that supports filtering by truck number and includes an interface for updating driver status.MediumSystem design· Uber
  16. 40You're a PM at Uber; design a smartwatch app.MediumProductSystem design· Microsoft
  17. 41Design a vending machine for people with disabilities.MediumProductSystem design· Affirm
  18. 42Design a web crawler.MediumSystem design· Anthropic, Google
  19. 43Design a load balancer.MediumSystem design· Google, Mastercard
  20. 44Design an elevator for blind users.MediumProductSystem design· GCGoogle Cloud (GCP)
  21. 45Pick an airport and estimate the number of people going through the security scan every day.MediumProductSystem design· Google
  22. 46Estimate the amount of storage needed for Google Photos.MediumProductSystem design· Google
  23. 47What metrics would you track to evaluate the performance of your ML pipeline?MediumAI MLSystem design· PAPerplexity AI
  24. 48Explain the leader follower election in a distributed system.MediumSystem design· Microsoft