Web Developer Interview Questions

131 Web Developer Questions and Answers by on August 5th, 2021

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

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All 131 Web Developer Interview Questions

  1. Web Developer Interview Questions


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

  2. 2.

    How does the browser determine where to place positioned elements?

  3. 3.

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

  4. 4.

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

  5. 5.

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

  6. 6.

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

  7. 7.

    Do you enjoy working long hours on projects?

  8. 8.

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

  9. 9.

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

  10. 10.

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

  11. 11.

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

  12. 12.

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

  13. 13.

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

  14. 14.

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

  15. 15.

    What do you know about CORS?

  16. 16.

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

  17. 17.

    How do you organize your JavaScript code?

  18. 18.

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

  19. 19.

    Can you discuss the use of namespacing in JavaScript?

  20. 20.

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

  21. 21.

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

  22. 22.

    Which responsive frameworks do you work with or recommend?

  23. 23.

    Do you know the programming language we primarily use?

  24. 24.

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

  25. 25.

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

  26. 26.

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

  27. 27.

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

  28. 28.

    What's the difference between SOAP and REST?

  29. 29.

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

  30. 30.

    What do you do when an application stops working?

  31. Front End Developer Interview Questions


    Describe what CSS selector specificity is and how it works?

  32. 32.

    Can you describe Ajax and discuss what it is used for?

  33. 33.

    Please describe what the acronym NPM stands for and how it is used in front end development.

  34. 34.

    What is Representational State Transfer, or REST, and how would you use it when developing a front end for a website?

  35. 35.

    Can you discuss the differences between session storage, cookies, and local storage?

  36. 36.

    Our web development team uses JSONP. Are you familiar with this, and do you use it in your web development?

  37. 37.

    Can you provide men an overview of the Delegation Event Model?

  38. 38.

    Please discuss the differences between the call, apply and bind commands?

  39. 39.

    What does the acronym CORS stand for, and what programming issue does it help resolve?

  40. 40.

    Are you familiar with the term CoffeeScript, and do you know how it is used in front end web development?

  41. 41.

    What methodologies do you use to ensure that your web application is user-friendly?

  42. 42.

    Please discuss CSS float and give me an example of how you use it when developing web sites.

  43. 43.

    How do you increase the performance of a new web site you develop?

  44. 44.

    How do you use a closure when you are writing front end code?

  45. 45.

    What features of HTML5 have you implemented in your front end development projects?

  46. 46.

    How do you go about addressing browser-specific rendering challenges?

  47. 47.

    Please discuss the difference between null, undefined or undeclared variables.

  48. 48.

    Tell me about the SEO best practices or techniques you use in your work.

  49. 49.

    Can you explain how prototypal inheritance works?

  50. 50.

    When working on a web development project, what do you do to improve your code's maintainability?

  51. 51.

    How has working with the 'this' keyword changed in JavaScript ES6?

  52. 52.

    Can you explain the techniques you use to ensure front-end security?

  53. 53.

    What version control systems have you worked with?

  54. 54.

    Can you define Block Formatting Context and describe how it works?

  55. 55.

    Walk me through your workflow when you are creating a web page.

  56. 56.

    Talk to me about z-index and how stacking context is formed.

  57. 57.

    What are floats, and how they work?

  58. 58.

    Can you compare progressive enhancement and graceful degradation?

  59. 59.

    How would you integrate several different stylesheets into a website?

  60. 60.

    Which technique do you prefer to use, resetting or normalizing CSS, and why?

  61. Back End Developer Interview Questions


    What programming languages do you prefer to work with and why?

  62. 62.

    Can you describe the software lifecycle methodology used in your current position?

  63. 63.

    What is the largest software project you have ever worked on? What was your role in the project?

  64. 64.

    What experience do you have working with object-oriented programming (OOP) languages?

  65. 65.

    Have you ever experienced a problem or encountered issues when using Object-Oriented Programming (OOP?)

  66. 66.

    What Is CAP Theorem? How do you use it in your work?

  67. 67.

    What does the acronym REST stand for?

  68. 68.

    Can you describe a NoSQL database and how it differs from a relational database?

  69. 69.

    Can you describe an SQL injection attack? What measures can be taken to prevent it?

  70. 70.

    Can you describe the programming methodology known as Continuous Integration?

  71. 71.

    What advantages does MongoDB have over common SQL databases, such as Oracle?

  72. 72.

    Which do you prefer, acceptance testing or functional testing?

  73. 73.

    Can you discuss the main elements of a web API?

  74. 74.

    How can you prevent SQL Injection attacks?

  75. 75.

    Can you describe some steps used in performance testing?

  76. 76.

    Are you familiar with Go? What advantages does it offer a programmer?

  77. 77.

    What advantages do web services provide over hosted applications?

  78. 78.

    What is Containerization? What advantages does it offer over virtualization?

  79. 79.

    Can you discuss the difference between a WHERE clause and a HAVING clause?

  80. 80.

    Can you provide some reasons why you would utilize a microservices architecture?

  81. 81.

    What are some of the performance testing best practices you use when creating website back ends?

  82. 82.

    In your opinion, what is meant by high availability (HA)?

  83. 83.

    Can you discuss the ACID property of a relational database system?

  84. 84.

    What are RESTful web services, and are there any disadvantages to using them when developing a website back end?

  85. 85.

    What are some of the techniques you use to manage user sessions on your websites?

  86. 86.

    I've heard about the DRY and DIE principles related to website backend development. Can you explain these principles?

  87. 87.

    Can you discuss the differences between a clustered and a non-clustered index?

  88. 88.

    Continuous integration, continuous delivery, and continuous deployment seem to be similar to each other. Can you explain the differences between them?

  89. 89.

    Please walk me through the differences between JOIN and UNION?

  90. 90.

    Our organization uses Monolithic, SOA and Microservices Architectures. Are you familiar with these and how they differ?

  91. Python Developer Interview Questions


    Can you describe the major features of the Python programming language?

  92. 92.

    In your opinion, what are the benefits of writing code in Python?

  93. 93.

    Why is Python described as an 'Interpreted' programming language?

  94. 94.

    What is your process for tracking versions of your code?

  95. 95.

    How does Python manage memory?

  96. 96.

    What are some of the common modules that are part of Python?

  97. 97.

    What are the differences between local and global variables in Python?

  98. 98.

    Can you describe some of the type conversions used with writing code in Python?

  99. 99.

    Please walk me through the steps of installing Python on Windows.

  100. 100.

    Describe the differences between arrays and lists as Python uses them.

  101. 101.

    What tools do you use to identify bugs in your code?

  102. 102.

    Explain a Python dictionary and what it is used for.

  103. 103.

    Can you discuss Python lists and NumPy arrays, and why one is preferable to the other?

  104. 104.

    Describe the differences between deep copy and shallow copy when writing code in Python.

  105. 105.

    What are some of the common mistakes coders make when using Python?

  106. 106.

    How do you perform compiling and linking in Python?

  107. 107.

    Can you give me an example of Inheritance and describe what it is used for?

  108. 108.

    What is meant by Python supporting multiple instances of Inheritance?

  109. 109.

    Have you ever used Python to create a personal application?

  110. 110.

    What is Flask as it is used in Python, and what are some of its benefits?

  111. 111.

    What does the map function do in Python?

  112. Java Developer Interview Questions


    What are the key elements of the Java programming language?

  113. 113.

    Within Java, what are the differences between path and classpath variables?

  114. 114.

    Can you discuss the importance of the main() method in Java?

  115. 115.

    How is Enum used in Java?

  116. 116.

    In your opinion, Is Java Pass By Value or Pass By Reference?

  117. 117.

    Can you define the final keyword in Java?

  118. 118.

    How is a volatile keyword used in Java?

  119. 119.

    Can you discuss what a static import is and what the pitfalls of using this are?

  120. 120.

    How are access modifiers in used Java?

  121. 121.

    What is Composition, as used in Java?

  122. 122.

    Tell me about the Java Reflection API?

  123. 123.

    What is a marker interface, and how do you use it when writing Java code?

  124. 124.

    Can you tell me what a Compare and Swap algorithm is and how you use it when coding in Java?

  125. 125.

    Can you discuss the differences between a user and a daemon thread?

  126. 126.

    Talk about what a Java timer class is and how you schedule a task to run after a specific interval?

  127. 127.

    Please define a CountDownLatch in the context of Java?

  128. 128.

    How does an OutOfMemoryError impact a program written in Java, and how can this be corrected?

  129. 129.

    When programming in Java, can you have an empty catch block?

  130. 130.

    Please describe the JDBC API and discuss how it is used?

  131. 131.

    What are some examples of JDBC drivers?

Web Developer Position Summary

Businesses and other organizations have incorporated websites and web applications into their operations in a number of different ways. They serve to attract customers, execute transactions, provide access to information and create portals used by clients, suppliers, partners and employees to interact with the organization and gain access to services. Web Developers perform a critical role in developing and maintaining commercial and proprietary websites and applications which perform the functions organizations use every day. A Web Developer must have a detailed understanding of an organizations operations, customers, products and services, stakeholder community and other aspects of their business. They need to be aware of how these individual entities interact with each other and how websites and web applications and facilitate the numerous interactions and transactions conducted daily. Finally, Web Developers should be knowledgeable in the organization’s IT infrastructure, including hardware, operating systems, software, and network so they can optimize their web sites and applications for the environment.

The Web Developer's main functions are creating websites and applications to help an organization manage its business. Components of these functions include:

  • Analyzing User Needs
  • Design, Test and Development of the Websites and Applications
  • Maintenance and Updates
  • End-of-life and Transition to a New Sites & Application

Web Developer Duties and Responsibilities

The specific responsibilities of Web Developers vary widely, depending on the type of websites and applications they are developing, the organization they work for and their role on the web development team. In general, they need to understand the needs of the users, develop websites and applications through the use of programming languages, graphic designs user interfaces, and algorithms, document the process using manuals, diagrams and flowcharts, and testing the functionality of the websites and applications before releasing them for use.

The responsibilities of a Web Developer include:

  • Collaborating with colleagues, suppliers, designers, hardware support teams, other parts of the organizations and end-users to develop technical designs
  • Enhancing websites and applications through user feedback and performance measurement, seeking opportunities for improvement
  • Maintaining and improving existing designs, content, and codebases for reuse and performing peer reviews of any changes in these elements
  • Improving web development processes through quality initiatives and by developing standard operating procedures
  • Maintaining knowledge of industry developments and new technologies that may impact their designs
  • Sharing information with their peers and educating junior web developers


The minimum requirements you will need to apply for a position as a Web Developer include a degree in software engineering, computer science, mathematics, or a related field. You will also need to demonstrate expertise in popular programming languages such as C++, Pearl, Python or Ruby. Understanding of design principals, e-commerce, business operations and end-user experiences is also essential. For advanced Web Developer positions, employers expect you to have several years of development experience, be able to provide examples of websites and web-based applications you have developed, and possibly show experience leading a team of web developers.

Soft Skills for Web Developers

In addition to the hard skills directly related to the work a Web Developer performs, you will likely be asked about several soft skills during an interview. Examples of these are:

  • Strong analytical and reasoning skills and the ability to picture processes and their outcomes
  • A knack for solving problems and developing solutions to complex issues
  • The ability to work collaboratively across the organization
  • Strong oral and written communication skills
  • Well-developed organizational skills and attention to detail

Web Developer Interview Process

When preparing for an interview as a Web Developer, you can anticipate that the interview will occur in 3 Phases:

  • Screening
  • Phone or Video Interview
  • Onsite Interview

Each of these will involve various types of questions and some hands-on exercises.

Screening in Response to a Referral or Online Application

The initial screening is used to validate your resume and learn more about your experience, skills and background. You may also be asked about your salary expectations, availability and other employment-related issues. Finally, they will discuss the next step in the process and offer to answer any questions you may have. This takes about 15-30 minutes.

Onsite Interview

The onsite interview is the last phase of the interview process. This involves meeting with one or more contacts from different parts of the prospective organization. The people you interview with may include HR representatives, the Hiring Manager, Managers from other departments such as Quality, Product, Operations, Finance, and Sales, and possibly other Web Developers who are members of the team you will be working on. Onsite interviews can last from a few hours to over several days, depending on the organization and the type of job you are interviewing for. You are likely to be asked a wide range of questions from every category. These include:

Technical Phone or Video Interview

The next step in the process is a phone or video interview. This will be more in-depth than the initial screening and explores your qualifications more extensively. This part of the interview will include several different types of questions. These include general, technical, and operational. The purpose of these questions is to explore your web development skills and experience in more detail. You may also be asked to solve a web design or development challenge, either in real-time or as a take-home exercise. Usually, the interviewer will allow you to do the exercise in a language you are comfortable programming in. The phone or video interview will take from 1-2 hours, depending on whether there is a live development requirement.

Being prepared for these types of questions and practicing your responses before the interview will help you to be ready to respond to them during the onsite phase of the interview process.

  • General - Meant to get to know you, start you talking, learn more about your background and collect information to use throughout the rest of the interview.
  • Technical - These questions explore your technical skills, knowledge and expertise. They ask about terminology, concepts, processes, and other Web Development issues.
  • Operational - Operational questions investigate how you perform your job and go about creating websites and applications. They ask you to describe the steps you take to complete a task or to walk the interviewer through the processes you use in your job.
  • Behavioral - Behavioral questions seek to understand how you react to specific situations such as conflict, challenges, change and similar occurrences on the job site. They do this by asking about your past experiences with these types of situations and t
  • Situational - Situational questions are similar to behavioral ones, except they create future scenarios to discover your methods for resolving issues. This requires you to project what you would do when confronted with a situation described by the intervi
  • Cultural- These questions help the interviewer determine how well you will fit into the organization and contribute to its culture or conflict with it. Questions will explore your work style, preferences, ability to collaborate and other personal traits.

The interview typically concludes with either an immediate job offer or a brief description of how the overall interview process is being conducted and when you can expect to hear about the organization's decision. Additional steps in the process may include asking you to provide references the employer can contact or participating in online or live tests to determine your personality type, such as Myers-Briggs.