MockQuestions

Web Developer Mock Interview

To help you prepare for your Web Developer interview, here are 30 interview questions and answer examples.

Web Developer was written by and updated on August 5th, 2021. Learn more here.

Question 1 of 30

Using jQuery, if you wanted to make a div move along the screen, what function would you most likely use?

How to Answer

This is another specific technical question. As was mentioned earlier, the majority of your interview will involve specific technical questions. Researching the company, its products, and the technology that it uses is the best way to be prepared to answer these types of questions. It will also help you frame your answers to address the technical and business issues the company is hiring you to help them resolve.

Written by William Swansen on August 5th, 2021

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List of 30 Web Developer Interview Questions & Answers

  • 1.

    Using jQuery, if you wanted to make a div move along the screen, what function would you most likely use?

      How to Answer

      This is another specific technical question. As was mentioned earlier, the majority of your interview will involve specific technical questions. Researching the company, its products, and the technology that it uses is the best way to be prepared to answer these types of questions. It will also help you frame your answers to address the technical and business issues the company is hiring you to help them resolve.

      Written by William Swansen on August 5th, 2021

      1st Answer Example

      "The easiest way to make a div move along the screen is to use the jQuery animate feature. The standard way of doing this is to position the element as absolute and then animate it left or right. You can also accomplish those by increasing or decreasing either the left or right margin."

      Written by William Swansen on August 5th, 2021

      Experienced

      "A div element can be made to move along the screen in several ways. The easiest of these is first to position the element absolutely and then animate the left or right CSS property of the element. Another workaround to this is to increase or decrease the margins of the page in which the element is displayed. When doing this, you can anticipate a drop in the performance of the web page with the animation lasts more than a few seconds."

      Written by William Swansen on August 5th, 2021

  • 2.

    What are the differences between JPEG and PNG compression, and when would you use each of these?

      How to Answer

      You probably already recognized this as another technical question. As the interview progresses, the questions will become more specific and more difficult. This indicates that the interviewer is gaining confidence in your qualifications and is willing to explore more topics in depth. Continue to answer technical questions in the same manner you have used throughout the interview.

      Written by William Swansen on August 5th, 2021

      1st Answer Example

      "I use both JPEG and PNG compression in my web designs. JPEG works best for photos, drawings, illustrations, and other color-rich elements. PNG is a less aggressive compression methodology and results and slightly larger file sizes. PNG is more appropriate for web design elements, including text, logos, icons, and screenshots."

      Written by William Swansen on August 5th, 2021

  • 3.

    Can you review this code and identify any errors you see?

      How to Answer

      During the interview for a web developer's position, you may be asked to perform practical tasks such as this one. This provides the interviewer with a live demonstration of your skills. The tasks may be presented to you as written code which you need to debug or discuss, or the interviewer may provide you with a description of a function of the page then ask you to write the code for it. Practicing your coding skills for common tasks before the interview will help you be prepared for this.

      Written by William Swansen on August 5th, 2021

      1st Answer Example

      "After reviewing this code, I can see several different errors and it. Some of these are syntax, and others relate to the commands and functions called by the code. To thoroughly analyze the code, I would typically use a common debugging tool such as GDB. However, without the tool, the specific problems I found are... (then describe each issue you found and how you would fix it)."

      Written by William Swansen on August 5th, 2021

  • 4.

    Can you discuss the use of namespacing in JavaScript?

      How to Answer

      This technical question asks you to discuss a term used in a web developer's job. The interviewer will ask many different questions similar to this throughout the interview. These questions help them understand your technical expertise and provide them with a demonstration of your communication skills. Technical questions are best answered concisely and directly, with little embellishment. The interviewer will ask a follow-up question if they need additional information about the topic.

      Written by William Swansen on August 5th, 2021

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  • 5.

    When developing a web application, do you prioritize SEO, maintainability, UX, performance, or security?

      How to Answer

      The interviewer will always ask some version of this question to determine your core competency as a web developer. Your response will also indicate which factors you prioritize when coding. For example, if you have experience in the finance industry, you may favor security over SEO. If you have developed an online e-commerce site, performance and SEO will be more important to you. Researching the organization and understanding its business model will give you a clue about which factors are more important and enable you to structure your answer appropriately.

      Written by William Swansen on August 5th, 2021

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  • 6.

    How do you organize your JavaScript code?

      How to Answer

      There is no right or wrong way to organize JavaScript code. The interviewer will ask this question to better understand your web development methodologies and how you do your job. This will confirm your experience and let them know if your work is compatible with how their team currently performs similar tasks. They are also interested in seeing if you have work systems that will help improve their web development team's operations. Answering this question accurately is important for these reasons.

      Written by William Swansen on August 5th, 2021

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  • 7.

    Can you explain what a RESTful web service is and the purpose of each HTTP request method?

      How to Answer

      RESTful is a common web technology that relies on HTTP. Each RESTful request performs a specific action. The interviewer will ask you about these to confirm your technical expertise and ability to use this technology. They are also interested in how you describe complex technical concepts using simple, easy-to-understand language. You will need this skill when collaborating with website project stakeholders from outside of the technical organization.

      Written by William Swansen on August 5th, 2021

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  • 8.

    What do you know about CORS?

      How to Answer

      During the interview for the web developer's position, you will be asked many different questions about the technology used in your field. While you can't know about all the available technologies, you should be familiar with the most common ones. Additionally, the interviewer will be interested if you are up to date on some of the more recently released technologies. Reviewing these before the interview will increase your awareness and ability to at least identify what they do.

      Written by William Swansen on August 5th, 2021

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  • 9.

    What frameworks and tools do you use to identify and fix a performance bug?

      How to Answer

      An interviewer will be very interested in your ability to use debugging tools to optimize a website's performance. Having an appealing website that attracts visitors is only the first step in the process. If the website underperforms or doesn't provide the information the visitors are interested in, they will stop using it. The interviewer wants to make sure that you are familiar with the debugging tools and have a structured framework to analyze and optimize a website's performance.

      Written by William Swansen on August 5th, 2021

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  • 10.

    Can you describe the workflow you use when developing a website or app?

      How to Answer

      The interviewer will ask this question to determine how you approach a web development project, your methodologies, and your steps to develop a website. This will tell them that you have experience in this area and provide them information about whether your workflow is compatible with the rest of their team. A good way to respond to this question is to describe your workflow step by step in simple, easy-to-understand language.

      Written by William Swansen on August 5th, 2021

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  • 11.

    Have you ever done pair programming, and if so, what do you think of it?

      How to Answer

      Pair programming is a relatively new development within the website development and design field. This involves two people working together to code a project. Pair programming is an Agile development technique that not all web developers have experience with or prefer. The interviewer is interested in assessing whether you would be willing to sit down with a colleague and sort through your code. If you have experience with this, you can state this and describe your preferences for designing a website using this methodology. If you haven't, you can express your familiarity with the practice and describe whether you would be inclined to use it in the future.

      Written by William Swansen on August 5th, 2021

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  • 12.

    What do you do when an application stops working?

      How to Answer

      By asking this question, the interviewer is trying to understand your ability to debug a program. Troubleshooting and debugging are key skills web developers must possess. The best way to respond to this question is generally stating the techniques you use to solve problems within a program you developed. Don't get mired in the details. The interviewer will ask follow-up questions if they need more information.

      Written by William Swansen on August 5th, 2021

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  • 13.

    Pretend I'm a tech novice. Can you explain what Namespacing in JavaScript is in plain English?

      How to Answer

      This is a fundamental JavaScript question that should be easy for its experienced web developers to answer. The key here is using plain English as though you were speaking with somebody who had no technical background. This requires you not to use acronyms or any jargon somebody from outside the industry would not understand.

      Written by William Swansen on August 5th, 2021

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  • 14.

    What's the difference between SOAP and REST?

      How to Answer

      Yet another technical question asking you to define the difference between two web service protocols. The purpose of this question is to determine if you know both of these protocols and to understand which one you prefer. Your research should tell you which protocol the company prefers. Whether you prefer the same one or not, you should be able to explain your answer and your rationale for your preference.

      Written by William Swansen on August 5th, 2021

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  • 15.

    Which Content Management Systems (CMS) have you worked with?

      How to Answer

      This was a relatively general question which the interviewer will ask early in the interview. The purpose of this is to understand your experience and skills and to ease you into the interview. It also provides the interviewer with the information they can use to formulate other questions.

      Written by William Swansen on August 5th, 2021

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  • 16.

    Tell me some considerations in selecting a font size for an adaptive web site.

      How to Answer

      This is a technical question for a web developer role. Interviewers ask technical questions to qualify your knowledge and skills for the position you are interviewing for. Technical questions are best answered using brief explanations of the term or concept, with little embellishment. The interviewer will request additional details if they require them.

      Written by William Swansen on August 5th, 2021

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  • 17.

    Explain to me briefly what the hide function is actually doing in jQuery withi the CSS.

      How to Answer

      This is a specific technical question. The interviewer is asking you to define the function of a single command within the cascading style sheet, or CSS. As the interview progresses, the technical questions will become more specific and more difficult. This is a positive sign that the interviewer is gaining confidence in your skills and is willing to dig deeper to determine just how much you know. It is advisable to review the commands you typically use when developing a web page before the interview.

      Written by William Swansen on August 5th, 2021

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  • 18.

    Can you list some of the input types that are new to HTML5?

      How to Answer

      An interviewer will ask this type of question to determine if you stay abreast of new developments in the web development industry. Technology changes very quickly, and to be an effective web developer you need to stay current on evolving developments in this field. You should also be prepared to describe how you do this, such as reading blogs, attending training, watching videos, and working with your peers to improve your skills and knowledge.

      Written by William Swansen on August 5th, 2021

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  • 19.

    Do you know the programming language we primarily use?

      How to Answer

      By asking this question, the interviewer is seeking to understand two things. The first is whether you are familiar with the tools and languages they currently use for their web development efforts. They also want to understand whether you took the time to research their company and learn about their processes. Interviews are often won or lost before you even arrive, based on the amount of research you do and what you learn about the job and the company. The better you understand their operations, the more successful your interview will be, and the more likely they will offer you the job. You can answer those in either a positive or negative manner.

      Written by William Swansen on August 5th, 2021

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  • 20.

    Which responsive frameworks do you work with or recommend?

      How to Answer

      When an interviewer asks this type of question, they seek to learn whether you are familiar with the tools and processes they already use in their operations. Additionally, they may want to see if you can recommend new tools or processes that they may consider adopting. One of the most desired soft skills employers look for is creativity. You can use your answer to this question to demonstrate your creativity and innovation skills.

      Written by William Swansen on August 5th, 2021

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  • 21.

    What is the default value for the display attribute for the image element?

      How to Answer

      An interviewer will ask this technical question to confirm your web development skills and ensure that you know some of the basic commands used in this profession. By reviewing these questions, you should be prepared for this as well as any related questions. The best way to be ready for an interview is to review these questions and practice them aloud. If possible, record yourself to hear how you sound and make any improvements you feel are necessary.

      Written by William Swansen on August 5th, 2021

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  • 22.

    What are the five possible values for position for elements in a web page?

      How to Answer

      This technical question is similar to the previous one. Interviewers will often ask about topics in several different ways to confirm your understanding of the topic they are curious about. You may also encounter multiple interviews or group interviews in which each person you speak with will ask you the same question but in a different manner. If this occurs, it indicates that the topic they are asking about is important to the job you will be doing. This also gives you clues as to follow-up or subsequent questions you can expect.

      Written by William Swansen on August 5th, 2021

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  • 23.

    How does the browser determine where to place positioned elements?

      How to Answer

      This is another technical question the interviewer will ask to determine your knowledge of web development technologies and practices. As we've mentioned before, technical questions are best answered straightforwardly and succinctly. There's no need to embellish or provide detailed answers. The interviewer will follow up if they require additional information.

      Written by William Swansen on August 5th, 2021

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  • 24.

    Name several reasons why a website is not performing well or is slow to respond to user prompts.

      How to Answer

      During an interview, the hiring manager seeks to fully understand your competencies and abilities related to the position for which they are interviewing you. This particular question seeks to determine your ability to diagnose and address the poor performance of a website. Since the question is rather general, the best way to respond is by citing 2 to 3 examples of why a website is performing badly and what you would do to fix them.

      Written by William Swansen on August 5th, 2021

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  • 25.

    Do you enjoy working long hours on projects?

      How to Answer

      An interviewer will ask this type of question to seek the information the question requests and test your integrity. While they may be genuinely interested in whether you enjoy working long hours were willing to do it, they also want to see how you respond to this question. Working long hours may or may not be a requirement for this job. You should respond with an honest answer, but more importantly, be able to justify your response.

      Written by William Swansen on August 5th, 2021

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  • 26.

    What was your most successful website ever created? Why did it go so well?

      How to Answer

      This is another behavioral question that is similar, but opposite of the previous one. Asking this question after the last one about your least favorite website provides the interviewer with a clear idea of what you like and dislike. This enables them to determine if you are suited for the type of projects they will be assigning you. Again, use your pre-interview research to identify projects that align with those the employer will likely assign you to work on.

      Written by William Swansen on August 5th, 2021

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  • 27.

    What was your least favorite website you've created? Why did you feel this way?

      How to Answer

      This is an example of a behavioral question. Interviewers ask behavioral questions by presenting you with a scenario and then asking how you would respond to it. The purpose of these types of questions is to preview your behavior when you encounter situations typical in the job for which you are applying. Behavioral questions are best answered using the STAR format. You first describe the Situation, state the Task you must achieve, talk about the Actions you take, and then discuss the Results.

      Written by William Swansen on August 5th, 2021

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  • 28.

    Tell me about the most challenging website you created from start to finish.

      How to Answer

      While this may look like a technical question, it is actually an operational question. Rather than ask you about a specific element of web development and design, the interviewer is asking you about a process you use to develop a website. Their objective in asking this question is to determine if you have done work similar to the job for which they are hiring you. Based on your pre-interview research, you should describe a project similar to the type of work you will be doing with this organization.

      Written by William Swansen on August 5th, 2021

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  • 29.

    How would you write an SQL statement that would select only customers who made multiple orders within a single week?

      How to Answer

      This is a specific technical question in which the interviewer is asking you how to structure a piece of code. As a web developer, you may be asked actually to write code during the interview. This rarely occurs during a live interview, but you may be given a sign and liked this either before after, or as a separate element of the interview process. You should be prepared for this and may want to bring some materials to the interview that will help you comply with this request.

      Written by William Swansen on August 5th, 2021

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  • 30.

    What are the possible values for the display attributes that are supported by all browsers?

      How to Answer

      This is another technical question which the interviewer is using to determine your qualifications for this job. You can anticipate that most of the questions you will be asked in an interview for a web developer position will be technical. The best way to prepare for this is to read these questions aloud and then answer them using your own language, again out loud. This will help you build muscle memory and prepare you to answer these questions when asked by the interviewer.

      Written by William Swansen on August 5th, 2021

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