Top Front End Developer Interview Questions with Example Answers [2020]

Prepare for your Front End Developer interview by going through these most asked Front End Developer interview questions. Additionally, get access to sample answers and interviewer's expectations.

Front End Developer Questions

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  • Question: What is CSS float property and how does it work?

    • Question Overview: This question tests the applicant's knowledge of CSS properties. It's a basic question that helps you determine whether the person you're interviewing has a strong grasp of CSS fundamentals.

    Sample Answer: A CSS float tells the browser to put a particular element to the right side or the left side of the container. I use floats when I'm developing a page that dynamically resizes based on the user resolution.

      What the interviewer is looking for:
    • - A basic definition of CSS float
    • - An explanation of how this property works
    • - A demonstration of how the applicant uses this property in their code

  • Question: What happens when the user enters a URL?

    • Question Overview: This question tests the applicant's knowledge of the HTTP protocol. It's a basic question that can help you determine whether the person you're interviewing has a solid grasp of the basics of web development.

    Sample Answer: The user enters a URL into their browser and the browser sends a request to the server hosting the website. The server then sends back a response that includes the HTML for the page. The browser then renders the page based on this HTML.

      What the interviewer is looking for:
    • - Detailed explanation of the process
    • - Examples of how the applicant uses this knowledge in their work
    • - Confidence in explaining this process to any audience

  • Question: How do you keep up with new technologies?

    • Question Overview: Front end developers need to stay on top of the latest trends in web design and development. This question gives you insight into how they keep themselves informed about the latest developments in their field.

    Sample Answer: I subscribe to several blogs and newsletters that cover the latest developments in web design and development. I also attend conferences and meetups to learn more about the latest trends.

      What the interviewer is looking for:
    • - A list of resources that the applicant uses to stay up-to-date
    • - A history of staying up-to-date with new technologies
    • - A willingness to learn new things

  • Question: How will you differentiate between == and ===?

    • Question Overview: This question tests the applicant's knowledge of the JavaScript language and their ability to spot the difference between two similar operators.

    Sample Answer: === is a strict comparison operator that evaluates both operands and returns true if they're equal. == is a loose comparison operator that evaluates both operands and returns true if they're equal. I use === when I'm comparing objects or numbers for equality.

      What the interviewer is looking for:
    • - A clear explanation of the difference between these two operators
    • - An example of when to use each operator
    • - Confidence in explaining this technical concept to any audience

  • Question: What are the 3 most important languages for front end web development?

    • Question Overview: This question gives you insight into the applicant's knowledge of the most common languages used for front end development.

    Sample Answer: HTML, CSS, and JavaScript are the three most important languages for front end web development. I use these languages on a daily basis to create web applications and pages.

      What the interviewer is looking for:
    • - First-hand experience with the 3 languages
    • - Knowledge of the most important languages for front end development
    • - A list of other languages that the applicant uses

  • Question: Why do you want to work for us?

    • Question Overview: This question gives you insight into the applicant's interest in the company and their desire to work there.

    Sample Answer: I've been a fan of your company for a long time, and I'm excited to get the chance to work here. I think my skillset will be a great fit for your team.

      What the interviewer is looking for:
    • - A clear explanation of why the applicant wants to work for your company
    • - A clear explanation of how they fit into the company's mission
    • - A desire to work for your company

  • Question: What has been the most challenging project you have worked on so far?

    • Question Overview: This question gives you an idea of how the applicant handles difficult projects. It also gives you insight into their past work experience and how they've dealt with problems in the past.

    Sample Answer: The most challenging project I worked on was a website redesign for a large company. I had to work with a team of developers and designers to create a new design that met all of our client's requirements.

      What the interviewer is looking for:
    • - A description of the most challenging project
    • - How the applicant handled the challenge
    • - A description of what they learned from the project

  • Question: What do you like to code?

    • Question Overview: This question gives you an idea of what the applicant is interested in and what they're passionate about. It's a good way to see whether they're interested in the job you're offering.

    Sample Answer: I like to code in JavaScript and HTML5. I also enjoy using Bootstrap for web page layouts.

      What the interviewer is looking for:
    • - A list of the applicant's favorite programming languages
    • - Their favorite web frameworks
    • - A list of their favorite development tools