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
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4,310 questions

  1. 1993Imagine you've just started working with a client who wants to implement a cloud solution on their legacy system. What steps would you take? How would you tailor a demo for this client?HardBehavioralProduct· Microsoft
  2. 1994How would you implement dynamic pricing and A/B test it?HardDataProduct· Lyft
  3. 1995Implement file searchMediumCoding· Amazon
  4. 1996How would you implement a GDPR program for Google Services?HardBehavioralProduct· Google
  5. 1997Implement a k-nearest neighbors algorithm.EasyCodingAI ML· Amazon, Pinterest
  6. 1998Design and implement an in-memory key-value store that supports set, transactional begin, commit, and abort operations.HardCoding· OpenAI, xAI
  7. 1999Implement the memcpy() function in C.MediumCoding· Meta
  8. 2000Implement merge-sortMediumCoding· Walmart Labs
  9. 2001Implement a phrase search in a list of documents.MediumCoding· Amazon, Confluent
  10. 2002Implement a string sorting algorithm, treating digits as numbers.MediumCoding· Bolt
  11. 2003Implement TrieMediumCoding· Apple, Goldman Sachs
  12. 2004Implement wildcard pattern matching for a string (s) and a pattern (p) with '?' and '*' in a way that covers the entire input string.MediumCoding· Service Now
  13. 2005You're given a time-based key-value store that keeps having new key-value pairs added. Implement a windowed average.MediumCoding· Confluent
  14. 2006Why is it important for users to complete their LinkedIn profile? Discuss both user and enterprise perspectives.MediumProduct· LinkedIn
  15. 2007What is more important—shipping product on time or shipping products with the right features?MediumBehavioral· Motorola
  16. 2008What are the most important metrics for DoorDash?MediumData· Google
  17. 2009How would you improve retention for the Adobe Mobile Scan app?HardProduct· Adobe
  18. 2010You were hired by an airline consortium to improve the perception of air travel. What would you do with a budget of $10M in one year?MediumDataProduct· Stripe
  19. 2011How can Airbnb improve its Open Homes product, which provides free shelter for refugees?MediumProduct· Airbnb
  20. 2012How would you improve Airbnb's recommendation algorithm for guests?HardData· Airbnb, DoorDash
  21. 2013How would you improve the airline boarding experience?MediumProduct· Zillow
  22. 2014How would you improve airport layovers?MediumProduct· Meta
  23. 2015How would you improve Amazon Go?MediumProduct· Amazon
  24. 2016How would you improve Amazon's marketplace?MediumProduct· Amazon