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4,310 interview questions, answered.

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

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234 questions

  1. 25Design a currency exchange system.HardSystem designTechnical· TikTok
  2. 26Design a distributed database system, for example, Kafka.HardProductTechnical· Confluent
  3. 27Design an elevator algorithm to pick up guests.MediumDataTechnical· AADP, Google
  4. 28Design the architecture for Google Maps to load in under 100ms.HardTechnical· Google
  5. 29Explain how you would design Google Play Store, including your choice of database, its structure, and rationale.HardSystem designTechnical· Walmart Labs
  6. 30Design a security system for a hotel.HardProductTechnical· Microsoft
  7. 31Explain how to design and implement a password checker based on specific requirements.MediumCodingTechnical· Peloton
  8. 32Design a metrics and logging service.HardSystem designTechnical· Booking.com, Google
  9. 33Design a module to fetch a unique User ID from a pool of available User IDs and return the ID to the pool for later use.MediumTechnical· Dropbox
  10. 34Design a monitoring system for 1000 web servers.MediumSystem designTechnical· Amazon, Google
  11. 35Design a parking lot.MediumProductTechnical· Meta, Microsoft
  12. 36Design a product that helps college students in dorms befriend each other, including architecture and database schema.HardProductTechnical· Microsoft
  13. 37How would you design a relational schema for a calendar application?MediumSystem designTechnical· Better.com
  14. 38Design a system that ingests book reviews from Amazon.com and provides book recommendations on your website.HardSystem designTechnical· Amazon
  15. 39Design a system like YouTube.HardSystem designTechnical· Meta, Snowflake
  16. 40Design a system to track reviews abuse on Amazon.com.HardDataProduct· Amazon, DoorDash
  17. 41Design the system for a ticket selling web application.HardTechnical· Amazon, Google
  18. 42Design the SMS API for Twilio.HardProductTechnical· Stripe
  19. 43Design a visual landmark recognition system.HardSystem designTechnical· Google
  20. 44Design a voting system.HardTechnical· Meta
  21. 45Design YouTube's video recommendation engine.HardTechnical· Google
  22. 46Go into detail about a login endpoint.MediumTechnical· Google
  23. 47How would you detect a fraudulent transaction in a given geography where users mostly spend online?MediumTechnical· Visa
  24. 48What's the difference between an API and an SDK?MediumTechnical· Amazon