25 Top Full Stack Developer Interview Questions and Answers (2024)

Are you a full stack developer? Do you want to be one? If you’re not sure what a full stack developer is or if you want to imorove your skills before going for an interview, read on. This blog post will explore some of the most common full stack developer interview questions asked. We’ll also provide tips on how to answer them. If you’re a seasoned pro or just starting out, read on and get prepared!

Of course you will be anxious, especially if you sit for the interview at a Front End development company for the first time. Full Stack development is one of the hottest tech jobs, precisely in developed countries like America. In fact, experts say that it is difficult to fill this particular job position. Employers want to make sure they get the finest applicants due to the high average base salary of $111,540.

In this post, we share Full Stack developer interview questions and answers that will get you started and help you in passing the first interview of a Full Stack developer. In one-hour interviews, recruiters are unable to evaluate a candidate’s skill and expertise as a Full Stack developer.  

These Full Stack developer interview questions and answers are used to judge a candidate’s expertise and knowledge in the field. It should be noted that hiring managers do not require every response to be accurate and relevant. Without a doubt, hiring managers want to ensure if you are suitable for the position of full-stack web developer.

Who is a Full Stack Developer?

A full-stack developer is one who can develop both server and client-side software. Simply, a Full Stack developer knows about all the technologies that are used in developing a website. The work of front-end developers includes developing and designing client-side web architecture, server-side applications, developing APIs and RESTful services, web design elements, etc.

In addition to master the HTML and CSS, the developer should know:

  • Program a browser
  • Program a server
  • Program a database

Creating the Context of the Interview

In a Full Stack developer interview, the questions that are asked are quite different from the regular web developer interview questions. This is due to the different job roles for two positions.

A Full Stack web developer is able to work on both the front end and the backend of the website. Not only that, Full Stack web developers are able to handle the interactions, logic database, server configuration, and user authentication of an application.

In general, a candidate should be able to show excellent organizational skills and precise attention to detail throughout a Full Stack web developer interview. These professionals play a high skill intensive role and should display sharpness and presence of mind. Weaker candidates typically struggle to communicate clearly and exhibit low-quality interpersonal skills.

Full Stack Web Developer Interview Questions and Answers

Things are typically less stressful for new hires than for mid-level or professionals. In most cases, the questions begin with an icebreaker. Since there aren’t many projects that a professional with such a background can highlight, the hiring manager does his best to evaluate as much as he can during an interview.

  1. Which is your favorite language?

Multiple languages are used by full-stack developers. Having a single favorite coding language could be a cause for concern. A candidate must know the languages that he loves, especially ones with which the developer can design the front end and others with which he can handle the backend. A candidate should be able to illustrate this skillfully and keep in mind to mention the fundamental most popular languages, such as HTML, CSS, Python, etc.

  1. What are some full stack developer tools?

  • Visual Studio Code
  • Slack
  • TypeScript
  • CodePen
  • GitHub
  • WebStorm
  1. How do you stay updated about the latest industry trends?

This is a question to understand your involvement in technology. A good way to answer this question is to show your involvement in continuous learning and speak about the community meetup you visited. You can also speak about the forums and webinars you attended. If you have personal projects that you are working on and apply your skills, this is a good time to tell about the project as well.

  1. What have you learned recently?

This question is meant to test the authenticity of the answer you provided in the last question. It is important that you keep yourself up-to-date with the latest trends in your field. You can also talk about the website you have tested or a case study on a bug you have recently read about. It is important to keep in mind that you should never give the interviewer the impression that you haven’t learned anything in the last six months. This is a fast-changing technology world, and being up-to-date with the current trends is important.

  1. What are the important and must have qualities for a full-stack developer?

A full-stack developer interview is incomplete without this question, especially for freshers. A candidate should speak about the competency required in different coding languages. You should also talk about the coordination skills that are needed to work in a team, and excellent observation skills which are a prime factor for this role.

  1. What are the success factors for successive integration?

  • Keep a code repository updated
  • Build automation
  • Build with self testing
  • Everyday commitments to the baseline
  • Try to maintain a quick build
  • Automate Deployment
  1. Do you know Pair-Programming?

It is one of the core elements of extreme programming in which two web developers work on the same terminal. In which one developer types the code and the second one is responsible for reviewing the codes. The one who writes the code is called the “Driver” and the one who reviews the code is called “Navigator”.

  1. Tell us about a project you worked on, and what technologies did you use.

This aids in understanding the Full Stack developer’s methodology and also gives an idea of his sharpness and accuracy in choosing the best and right tool set. When explaining why you choose a particular tool set for web development, you must be as detailed and clear as you can. Show a balance between your front-end and back-end web development skills. It is good to show that you have more experience in one side of the development, but it is also important to show that you have the ability to work on both front-end and back-end.

  1. Did you ever find your colleagues’ code to be inefficient? What did you do about it?

This provides insight into a candidate’s standards of excellence and gives a sense of his ability to work well with colleagues. You must prove that you are having standards for quality assurance and can show comfort in pointing out the errors and bugs. Also, focus on demonstrating that you are good at providing positive feedback, and completing tasks without creating resentment.

  1. What is an event loop?

Although Node.js is a single-threaded programming language, it allows concurrency through the use of callbacks and events. Node JS uses asynchronous function calls to manage concurrency because each of its APIs is asynchronous and runs on a single thread. An observer pattern is used by Node.

Node thread maintains an event loop, and after a task is finished, it fires the associated event, informing the event listener function to begin processing the event.

  1. Do you know about design patterns?

While answering this question you should show that you have the ability to understand the errors that might come while developing web applications. If your knowledge is formal and in-depth, you must persuade the company to trust that you have the ability to comprehend clear and readable code.

  1. Tell us about the best implementation or debugging you have done.

It is a tricky question. This actually gives an idea to the hiring manager of the complexity and style of projects you have done in the past. You should also mention the issues you faced and the measures you have taken to overcome that roadblock. You can also tell the hiring manager what you have learned from the issue you have faced.

  1. What do you enjoy more, management or execution?

This question will be asked by every senior professional for Full Stack web developer interview questions. Basically, the hiring manager wants to know if you are comfortable in a technical role or want to switch to a managerial role. They can also ask if you prefer to work alone or in a team. From your interests, the company requirements can be different. So, it is good to establish the expectations at the front.

  1. What is continuous integration?

It is the process of using the codes that are automated and specially designed for testing. This process helps the developers to easily deploy the codes during the time of production. Continuous integration is used by the developers to integrate the codes several times a day. Codes are checked automatically, it helps in detecting errors quickly and locating them more easily.

  1. Explain the Difference between GraphQL and REST?

The main difference between REST APIs and GraphQL is that REST APIs are built on network-based software architecture. In contrast, GraphQL is a set of queries, specifications, and tools that operate across a single HTTP endpoint.

  1. Tell me about multithreading?

It is the process of improving the performance of the CPU. In general, it refers to a program’s ability to handle many requests from the same user simultaneously or to be managed by multiple users at once. Executing many processes that the operating system is capable of supporting is done by multi-threading.

  1. What is CORS?

CORS stands for Cross-Origin Resource Sharing and is a process of accessing various web resources on different domains. Web scripts can be freely connected with external content from the original domain with the aid of CORS. This further promotes improved web service integration.

  1. What DBMS technologies are used for full-stack development?

The DBMS technologies that are used for full-stack development are:

  • MySQL
  • Oracle
  • SQL server
  • MongoDB
  1. Explain referential transparency?

Referential transparency is one of functional programming features. Although it has been used to replace the statement in a program, the outcome remains unchanged.

  1. Can you tell us about the most puzzling programming challenge you came across?

Tell about the recent bug and error you came across and explain to the hiring manager how you overcame it. Tell the hiring manager you are the person who believes in collaborative work. Describe how you could get assistance from a coworker, an online community, or your mentor to tackle the problem. When in doubt, it’s always a good idea to inquire.

  1. What have you coded recently?

If you love technology, you are always working with it. Good programmers always have something to share. Candidates who code daily for personal learning and improvement in skill. Will always stand out here.

  1. What is the biggest mistake you have done in any of the projects? How did you solve it?

For this question, you need to be honest while answering and tell about the mistakes you think are serious. In addition, tell about the learnings from this mistake and explain the procedure you adopted to minimize the mistake.

  1. Explain inversion of control?

Hiring managers ask this question to check the candidate’s understanding of design patterns. It is a broad term used by software developers to describe a pattern used to decouple layers and components in a system.

  1. What is Long Polling?

It is a web development process that is used to surpass pushing data from the server to the client. The client requests information from the server by using a long polling pattern. Instead of sending an empty resource, if the server has no information about the client, the server will hold the request and wait for the information to be available.

  1. Explain the debugging process of a complex program?

Before debugging, it is necessary to analyze the presented problem. It is best to check the inputs and outputs at all times. Datasets for work and information must be tested against possible inputs and outputs. Correction entails avoiding the same mistake during the subsequent phase and project.

Wrapping Up

Whether you are an experienced candidate or fresher, no hiring manager would expect you to know everything. Before going for an interview be prepared because you don’t know what questions can be asked and show interest in the job. Be honest and transparent, and you will definitely crack the interview.


How Do I Prepare for a Full Stack Developer interview?

Go through the Full Stack developer interview questions and answers. Prepare a list of things you know about Full Stack technology, go through it, prepare yourself how you would answer for the question that will be asked. Lastly, be honest and transparent.

What should I ask for a Full Stack Developer?

● What is the difference between abstract and interface?
● What is a RESTful API?
● What is a callback in JavaScript?
● What do you mean by data attributes?

What is front-end and back-end?

Front-end means focusing on the visual elements of a website where a user will interact with it. Whereas back-end focuses on the side of a website user’s can’t see the server side.

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