YouTube Software Engineer Mock Interview

To help you prepare for a Software Engineer interview at YouTube, here are 30 interview questions and answer examples.

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Question 1 of 30

What do you feel are the critical principles of good software engineering?

"There are several critical principles I try to incorporate in any code I write. These include simplicity, standardization, and ease of understanding. By doing this, I ensure that the code is effective and easy to understand and update, if necessary. I also document my code so that other programmers can comprehend it and modify it if required. Are these the same practices you employ here at YouTube?"

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YouTube Software Engineer Interview Questions & Answers

Below is a list of our YouTube interview questions. Click on any interview question to view our answer advice and answer examples. You may view 5 answer examples before our paywall loads. Afterwards, you'll be asked to upgrade to view the rest of our answers.

  • 1. What do you feel are the critical principles of good software engineering?

  • 2. Here at YouTube, we encourage developing software that will scale to accommodate our growth. What methodologies do you use to ensure that your program will scale?

  • 3. Can you describe what you know about object-oriented programming?

  • 4. Which design patterns do you use, and in what situations do you use them?

  • 5. In your opinion, what is the difference between computer software and a computer program?

  • 6. How would you go about explaining cloud computing to someone at YouTube that doesn't have a technical background?

  • 7. What are some of the programming languages you are familiar with, and which ones do you prefer?

  • 8. Can you define black box testing and white box testing and discuss the differences between them?

  • 9. YouTube web developers are incorporating HTML5 in their most recent websites. Can you describe the functions of web workers in HTML5?

  • 10. What are the differences between blocking and non-blocking calls in the context of Node.js?

  • 11. Please describe a stack and the two operations it performs.

  • 12. What are the differences between an array and a stack?

  • 13. Please describe responsive design and the difference between fixed and fluid layouts.

  • 14. Here at YouTube, we have embraced Agile methodology. How experienced are you with the Agile software development process?

  • 15. Can you describe YouTube's software development life cycle as you understand it?

  • 16. YouTube is very proud of their products and the people who develop them. In your opinion, what distinguishes a great software engineer from an average one?

  • 17. What do you look for or check when reviewing another team member's code?

  • 18. Can you describe a tough software development problem you encountered in your last job and discuss how you solved it?

  • 19. How would you accelerate the response time of a website you created for us here at YouTube ?

  • 20. Which do you prefer - a micro-service approach or a monolithic app?

  • 21. Walk me through the steps to build a single page application with multiple sections using the programming framework in which you typically work.

  • 22. How do you go about organizing CSS files, and why do you prefer this approach?

  • 23. Many YouTube Software Engineers prefer to program in Java. Can you describe how you would implement linear search in JavaScript?

  • 24. How would you implement Dijkstra's Shortest Path using a programming language with which you are familiar?

  • 25. What process do you use to test and find bugs in an application you've developed?

  • 26. How do you go about addressing errors in your code?

  • 27. Describe the process you use to create a program, from requirements definition to delivery.

  • 28. Walk me through your process for designing scalable applications.

  • 29. If hired by YouTube, can you estimate what portion of your day will involve coding and other activities you will perform when not coding?

  • 30. Here at YouTube, we value work life balance and initiative. What personal software development projects have you worked on outside of work?