Full Stack Web Developer Interview Questions And Answers

Full Stack Developer Interview Questions

Are you a fresher getting ready for your first interview for the full stack web developer profile? If yes, then you’ve come to the right place. Preparing for interviews can be a daunting task; how and what can the interviewer possibly ask under an hour to decide whether or not you are fit for the role? However, hirers don’t just seek your knowledge but your skill set and aptitude. An interview is supposed to test your readiness for the job. Here we have enlisted the 30 most common full stack developer interview questions that might come in handy in your upcoming full stack web developer interview.

Full Stack Web Developer Interview Questions and Answers Are:-

1. How do you define a full stack developer?

Ans – This is the most fundamental question that a fresher should ready himself to answer. The response should be this: Full stack developers develop and design the front and back ends of web architecture or applications. They are also responsible for server-side applications, design databases, and more.

2. What defines a full stack developer?

Ans – A full stack developer comes with the following expertise:

  • Programming Language: Proficiency in more than 2 programming languages.
  • Frontend Technologies: The candidate should acquaint himself with technologies like HTML5, CSS3, Angular, etc.
  • Frameworks: The candidate should be thorough with lingos surrounding developmental frameworks like Spring, Boot, Django, PHP, Hibernate, and more.
  • Database: Familiarity with at least one database such as MySQL and Oracle.
  • Ability to Design: Handiness in UI and UX designing.

3. Tell us about your favorite language.

Ans – This is a tricky question, as picking out one language can have a wrong impression. A full stack web developer is supposed to work with multiple languages to effectively perform his tasks. Keep yourself equipped and ready with the knowledge of at least 2 or 3 languages to demonstrate your ability to handle the front end as well as the back end designs. One can include fundamental ones like HTML, CSS, Python, etc., in his portfolio.

4. What sources do you use to keep yourself updated with the trends in the industry?

Ans – This question aims to understand your involvement in the IT domain. A range of answers are available for this question, including telling the interviewer about your involvement in community forums or social media groups, any particular industry figure you follow on social media; websites or bloggers you follow from the industry, and more. 

5. Tell us about your last learning in this domain. 

Ans – This is a follow-up question to the previous one to test how true you are to your words. You can include a website you have recently tested, including all the pain points and solutions you might have drawn. If you haven’t done it, you can talk about an intriguing case study that you might have read. The idea is to give an impression to the interviewer that you like to stay in pace with this fast-changing industry.

6. Have you been coding currently or perhaps in the past?

Ans – Typically, a coder (working or not) loves the technology and engages himself actively in it. As a fresher, chances are you might be coding something for recreational reasons. If you’re one of such people, these full stack web developer interview questions are your chance to shine and stand tall in the crowd of freshers. Share your experience and learnings in coding with the interviewer to tell how serious you are about the profession. 

7. What makes an excellent full stack developer, according to you?

Ans – This is a subjective question and should be answered most authentically. Take time to contemplate why you chose this field. Imagine yourself working at your dream office; what would you be doing if you were hired? A few add-ons to this question can be given as coordination skills and having an eye for details.

8. Which languages and technologies would you use if given a task to develop a website from scratch?

Ans – This particular question can take a fresher by surprise as he comes with zero experience at working. However, remember this question aims to understand how the candidate explores new circumstances. Try to recollect the theoretical knowledge you might have earned during your schooling or through self-studying and organize it coherently to put forth. The goal is to demonstrate your ability to navigate through a complex problem.

9. What differentiates MVC from MVP?

Ans – Model View Controller or MVC and Model View Presenter or MVP are architectural patterns used to develop applications. The significant difference between MVC and MVP is that MVC does not pass the data from the Model to the View. It only notifies the View to get the data from the Model. The second significant difference is that MVC is used in the web framework while MVP is used in app development.

10. What is pair programming?

Ans – Pair Programming is two developers’ extreme programming task, which requires disciplined coordination. One of the developers is called ‘driver’ and the other is called ‘navigator.’ The former codes while the latter reviews the codes. 

11. What is CORS?

Ans – CORS or Cross-Origin Resource Sharing includes accessing multiple web resources on multiple domains. CORS enables web scripts to integrate with external content of the original domain, resulting in seamless integration between web services.

12. Tell us the difference between GraphQL and REST?

Ans – A crucial differentiating point is that GraphQL doesn’t harness trustworthy sources; instead, its function caters to app needs.

13. How can we reduce the web application load time?

Ans – We can reduce page load time by following small steps:-

  • Enable browser caching
  • Optimize images on the website
  • Reduce resources
  • Limit HTTP requests
  • Cut down redirects

14. What is Long Polling?

Ans – Long Polling is used to send client requests to the server. Suppose the server doesn’t contain any information regarding the query. In that case, it holds the requests and waits for the information to be available to send back to the client.

15. How can you improve a website’s performance?

Ans –

  • Reduce DNS lookup
  • Avoid duplicate codes
  • Defer parsing of JavaScript
  • Avoid inline JavaScript and CSS
  • Use srcset for responsive images

16. What do you understand by referential transparency? Where is it used?

Ans – A program may contain referential transparency when two expressions having the same value can be substituted for one another without altering the result of the program. Referential transparency is used in functional programming.

17. What is the promise?

Ans – It is an object that can return synchronously from an asynchronous function. It has three states: fulfilled, rejected, and pending.

18. What is RESTful API?

Ans – Representational State Transfer or REST is an architectural style used to create Web Services. It leverages HTTP requests to access and harness data, which developers can further update.

Application Program Interface or an API is a code for a website that enables communication between two software programs.

19. What is CI/CD?

Ans – CI/CD or Continuous Integration and Continuous Delivery are considered idle practices to develop applications where a frequent change in code happens. It is predominately used in DevOps and other fast methodologies. CI is a deployment practice where developers can integrate their codes into a shared repository several times a day. CD starts where CI ends; it delivers the application to the selected infrastructure.

20. Tell us the main difference between getting and Post requests.

Ans – Get request is designed to get data from the server, while Post request is designed to send data to the server. Search is an example of getting a request and Login is an example of a Post request.

21. Explain Semantic HTML.

Ans – Semantic HTML represents the meaning of the web page rather than just being a display. This element aids in communication by offering additional information about the document. It enables the browser to understand the content of a web page.

22. Compare the fail-fats and fail-safe iterators.

Ans – The major comparison point between these two is their operation. While the fail-fast operator operates directly on the collection, the fail-safe iterators work on the cloned copy of the collection.

23. How can we fix a connection leak in Java?

Ans – A connection leak is a situation where the developer fails to close the JDBC connection. Therefore, the apparent solution is to close the connection and by monitoring the error handling code.

24. What do you understand about Request Dispatcher?

Ans – It is an interface used to forward a request to another source in the same application. The resource can be HTML, JSO, or any other servlet.

25. Name the ways with which a developer can handle exceptions in the Spring MVC Framework?

Ans –

  • Controller-based
  • Global Exception Handler
  • Handler Exception Resolver

26. Can you tell us a few advantages of Hibernate over JDBS?

Ans – Hibernate eliminates boilerplate, which is added with JDBC API. Hibernate supports query caching, thus providing better performance than JDBC.

27. Tell us ways to avoid deadlock in JAVA.

Ans – Unnecessary locks can result in a deadlock situation, so using lock only when required is the first solution to avoid the deadlock in JAVA. Another key to this problem is to use a lock-free data structure.

28. What do you understand about the critical section?

Ans – It is a part of code in multi-threading that has to be specifically altered only by a thread. This section is typically protected by Semaphore or mutex.

29. What is numeric promotion?

Ans – As the name suggests, the conversion from a smaller numeric type to a more significant numeric type is numeric promotion. In this process, byte, char, and short are turned into int values; int values are turned into long values, and the long and float value is turned into double values as required.

30. Explain the SOLID principle in JAVA.

Ans – It is an object-oriented approach applicable to software structure designs. This approach ensures software is seamless, debugged, and can be refactored. SOLID is an acronym for:

  • Single Responsibility Principle
  • Open-Closed Principle
  • Liskov Substitution Principle
  • Interface Segregation Principle
  • Dependency Inversion Principle


Being a fresher doesn’t cut down your chance to get your dream job; it only offers recruiters to reach employees with new work perspectives and approaches. Therefore, it would be wise to hone your basics, not paying much attention to that you have no or less industry experience. Learn these full stack web developer interview questions and land your dream job! 

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