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Netflix Software Engineer
Interview Questions

26 Questions and Answers by
| William Swansen is an author, job search strategist and career advisor who assists individuals from all over the world.

Question 1 of 26

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

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Software Engineer Interview Questions

  1. 1.

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

      This is a general question that asks you to characterize what makes a software program efficient and effective. Your ability to do this will help the interviewer at Netflix understand your qualifications for the position. Your answer should incorporate both the requirements for the job, as stated in the job description, and your previous experience writing code. You should limit your answer to two or three important principles and anticipate a follow-up question from the interviewer.

      William's Answer

      "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 to do so. Are these the same practices you employ here at Netflix?"

  2. 2.

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

      This is a hybrid question, which has elements of both operational and technical questions. Since both operational and technical questions are responded to directly and succinctly, your answer will be the same. This question's broad nature also indicates that the interviewer will likely ask a follow-up question regardless of how you respond to their original question.

      William's Answer

      "When I'm asked to review another team member's code, the first thing I look for is to make sure that the code is efficient and follows our organization's guidelines. I'm careful not to personalize my review or make recommendations on how they could improve the code based on my personal preferences and coding style. I also strive to impart new knowledge to the coder when I make suggestions. An example of this would be showing them a more efficient way to accomplish the task, which they may not have considered."

  3. 3.

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

      Often during an interview, you are asked to define two terms used in the job and contrast them. This is an example of that type of question. When practicing interview questions, you'll note that your response is typically structured in a specific way. This makes responding to questions during the interview easier because you don't have to think about how to structure your answer. In this case, you want to first define each term and then describe the differences between them. You may also want to provide an example of how the concepts are used and the work you do.

      William's Answer

      "There are two major types of software testing. These include black box and white box. Black box testing is done without the tester knowing anything about how the application was created. On the other hand, white box testing is done by somebody who is intimately familiar with the structure and content of the application. White box testing allows the tester to examine the code and modify it to fix any issues they discover. Black box testing is typically used to simulate how the user views and interacts with the application."

  4. 4.

    Please describe a stack and the two operations it performs.

      When the Netflix interviewer asks you to describe something, you should immediately identify the question as being technical. When responding to a technical question, you first define the term or concept and then describe how it is used in the work you are performing. If the interviewer asks you follow-up questions, they are expressing a strong interest in this topic and indicating that it is important to their operations. This is a signal for you to expand on your answer and give them more details than you normally would.

      William's Answer

      "A stack is a data structure that has several distinct characteristics. Stacks use a LIFO process, organizing the data as last in, first out. This differs from a queue, which processes data as first-in, first-out. The two operations a stack performs are push, which is insertion of the data at the top of the stack, and pop, which is removal of the last item added to the stack."

  5. 5.

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

      When interviewing for a software engineering position at Netflix, the interviewer will ask various types of technical questions. These can range from very simple to very complex. Typically, the interviewer will start with simpler questions and progress to more complex ones. This indicates they are gaining confidence in your ability to do the job and are willing to explore your background in more detail. Regardless of their complexity, technical questions should always be answered briefly and to the point. You should anticipate follow-up questions any time you provide an answer to the interviewer.

      William's Answer

      "While JavaScript is widely used when creating web sites, it has its limitations. The language is single-threaded; therefore, concurrent or simultaneous operations are difficult to program. Web workers in HTML5 allow programmers to create scripts that run in the background and are invisible to the users. This is a workaround to executing multi-threaded application operations within JavaScript."

  6. 6.

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

      This is a general question that an interviewer at Netflix will ask to determine your proficiency in programming, and whether the languages you prefer are the same ones Netflix uses. During an interview, you will be asked a mix of general, operational, technical, and behavioral questions. Interviewers will ask these in random order, so you need to be prepared for each type of question.

      William's Answer

      "I'm familiar with many different software programming languages. These include C, C++, Java, Ruby, and Perl. My favorite is Ruby because it is easy to use, has a wide range of libraries already available, and is understood by most other programming professionals."

  7. 7.

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

      This operational question is seeking to understand how you go about doing your job on a day-to-day basis. Operational questions will ask you about the processes you use to accomplish the tasks required by this position. The best way to answer operational questions is directly and briefly. The Netflix interviewer will ask you a follow-up question if they need more information or want to explore the topic in more detail.

      William's Answer

      "During a normal day, I spend about 60% of my time writing code. The remainder of the day is spent reviewing my work, meeting with my manager, collaborating with other coders on my team, and learning new coding technologies and methodologies."

  8. 8.

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

      When an interviewer asks this type of question, they seek to understand what your perception of excellence in this role is. When answering the question, you should align your response with the job requirements, as defined in the job posting. You can also incorporate your past performance to demonstrate that you are aware of what excellence is and strive to achieve it.

      William's Answer

      "I believe the trait which distinguishes a great software engineer from an average one is being able to balance excellence and performance. While I strive to write perfect code, I recognize that the project has a deadline and needs to be accomplished on time and under budget. If I have to compromise the quality of my code, it is done in such a way that it will not impact the final performance of the product."

  9. 9.

    Walk me through your process for designing scalable applications.

      A Netflix interviewer will ask this type of question to understand how you go about doing your job. When asked to walk somebody through the process you use, you should divide it into several distinct steps and briefly describe each one. Be careful not to talk too much or over complicate your answer. If the interviewer needs more details, they will request them.

      William's Answer

      "The process I use for designing scalable applications begins with minimizing the code I use. I focus on the application's functional and non-functional requirements and then create code that satisfies these. I break the application down into distinct processes and code each one sequentially. The final step is to test the application and debug it."

  10. 10.

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

      When the interviewer asks you to describe a process, they are seeking to understand how you go about doing your job. When preparing for these types of questions, you should review the job description to fully understand the position's requirements and how the organization will expect you to do your job. You should also review the processes you currently use to ensure that they align with this role's requirements. Your answer should describe each step of the process in a sequential manner. Make sure to keep your response simple and to the point.

      William's Answer

      "The process I use to create a program begins with gaining a thorough understanding of the requirements for the application. Once I understand these, I create a flow diagram for how I believe the application should work. I then create code for each operation within the application. I submit the final program to the quality control team, which reviews and debugs the program. The final step is to get sign off from the users. Throughout the process, I document my work so that it can be replicated or updated, if needed."

  11. 11.

    How do you go about addressing errors in your code?

      Nobody is perfect, even the highly-skilled software engineers Netflix hires. Every software engineer has errors in the code they create. Denying this will be a red flag, which will make the interviewer skeptical of your qualifications. A better approach to answering this question is to acknowledge that you make errors, and you have a process you use to identify and correct them.

      William's Answer

      "After I create a segment of code, I take several steps to identify any errors and debug them. These include wrapping the code, using try/catch statements, and using various debugging tools. Once the entire program has been completed, I ask either my peers or the quality control team to review the code and identify any errors I may have missed."

  12. 12.

    Can you describe Netflix's software development life cycle as you understand it?

      This is an example of a hybrid operational and technical question. It asks you to define a concept relative to this profession and describe how you go about doing this job. When answering these types of questions, you should be direct and to the point. The Netflix interviewer is likely to ask several follow-up questions to explore this topic in more detail. Your answer should also be aligned with the requirements for this job, as defined in the job posting.

      William's Answer

      "The software development life cycle, or SDLC, is a process that most developers follow to create an application or program. The individual steps I understand Netflix uses include defining the requirements, planning the development, creating the code, testing it, and deploying the application. Specific methodologies used to accomplish this include the waterfall or spiral models, or the Agile framework. Is this accurate?"

  13. 13.

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

      This question is asking about your familiarity with a specific process used in software development. It may be a follow-up question to a previous answer you provided the interviewer. When asked this type of question, you should first define the concept or topic and then explain how it is used in your job. This will demonstrate your knowledge of the subject and your experience employing it in the work you do.

      William's Answer

      "I am very experienced with the Agile software development process. As you know, it is a methodology used when creating a program. Its central concept is iterative development. This involves collaboration between the software development team and the members of the organization who will be using the application. The benefit of this is that it allows for identifying and correcting issues at each stage of the process rather than after all the work is completed."

  14. 14.

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

      You should immediately recognize this is a technical question. Technical questions ask you to define a term or concept and then discuss how it is used in your work. When responding to this question, you should be brief and to the point. The interviewer at Netflix will request additional information if they need it. You should also provide an example, if possible, to further demonstrate your knowledge of the subject.

      William's Answer

      "Responsive design refers to the process of creating web content that is formatted according to the device you are using to browse the site. It uses media queries to address breakpoints and scale images, wrap text, and adjusts the layout so that the website is presented consistently across different devices. Compatible devices include computers, tablets, and mobile phones. Response designs utilize the fluid website design process. This differs from a fixed design in that it uses percentages versus fixed pixel widths."

  15. 15.

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

      The Netflix interviewer will likely ask a series of questions regarding your process because they seek to understand the steps you generally take in scenarios such as this one. As an experienced software engineer, you should be able to easily describe the procedures you use to test and debug the application you develop. Since this is an operational question, your answer should be direct and to the point. You should anticipate follow-up questions.

      William's Answer

      "Since I typically use the agile or waterfall development processes, just as you do here at Netflix, I test my application at various stages during the development process. This allows me to correct errors before they have greater implications later in the process. I use a variety of tools to test and debug the software. I also ask my peers to review my work during the development stage. Once the application is completed, I send it to the quality assurance team for final testing and debugging."

  16. 16.

    What are the differences between an array and a stack?

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  17. 17.

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

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  18. 18.

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

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  19. 19.

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

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  20. 20.

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

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  21. 21.

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

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  22. 22.

    How would you accelerate the response time of a website you created for us here at Netflix?

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  23. 23.

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

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  24. 24.

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

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  25. 25.

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

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  26. 26.

    How would you go about explaining Netflix's cloud computing environment to someone who doesn't have a technical background?

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