If you are a full-stack developer preparing for an interview, we will help you by providing you with some of the most commonly asked full-stack developer interview questions. We are also going to help you by preparing you with the answers to these questions.
But first, let us understand who can be a full-stack developer?
You are a full-stack developer if you can work and have knowledge of both front-end and back-end languages. Then, you can create websites for both the client and the service provider. Thus, you become a full-stack developer with time, expertise, and experience. But once you have gained all the knowledge, you can apply for this new role. It is one of the most sought after and challenging roles in the technological world. “Full stack” refers to the collection of a set of technologies that are required to complete a project. “Stack” refers to an amalgamation of sub-modules. These sub-modules or software components are combined to achieve the specified function without the need for other modules.
The technical interview questions for the full-stack developer are different from the computer engineer questions. Instead, the questions are asked to test your knowledge, experience, and capabilities.
Full-stack developer interview questions in India
1. Which programming language do you know?
2. Which programming language is your favourite and why?
3. What have you learned most recently?
It is an essential full-stack developer interview question. In this question, the interviewer wants to know what you have done during the past six months. While answering this question, you can explain the latest trends in the technical arena, your recent projects, or anything new that you have learned. You can discuss your personal or freelance projects as well. In short, you have to show the interviewer that you are up to date and have been busy working on different projects.
4. What do you do to keep yourself updated about the new trends?
As a full-stack developer, you require continuous learning about innovations and new technologies. When your interviewer asks you this question, you have to demonstrate your keenness to learn and grow with the ever-changing technological world. You can talk about forums, groups or other discussion platforms that you use to keep yourself updated. You can also cite an example of any recent technological development to demonstrate your knowledge.
5. What are you currently working on?
It is a common full-stack developer interview question. While answering this question, you can demonstrate your interests, knowledge, and skillset. As a successful coder, you must also be working on a personal project. You can explain in-depth about your project, the reason for choosing the project, the tools you are using, and your learnings from this project. You can also talk about any professional project that you have excellently performed. The interviewer is looking for your capabilities and diversity here. The interviewer can ask you more detailed questions about the tools that you answer over here. So, you can demonstrate your complete knowledge here. But only talk about those tools with which you have practical experience. Do not answer anything hypothetical in any of the full-stack developer interview question.
The above full-stack developer interview questions are introductory questions that can be asked to both freshers and experienced professionals. You must prepare well for these questions as these questions are going to give your first impression to the interviewer. In the next part, we are going to discuss technical interview questions.
6. Do you know about or have any experience with Pair-programming?
In this full-stack developer interview question, you can first explain the meaning of pair-programming. After that, you can discuss your experience.
Pair-programming is an element of extreme programming. Pair-programming involves two developers working simultaneously from the same terminal. The developer who types the codes is called the ‘driver’ and the developer who reviews the codes is called the ‘navigator’.
You can further talk about your experience of pair-programming. However, if you do not have such an experience, you can show your interest in experiencing it. For example,
‘I would love to be a part of pair-programming on some project.’ or,
‘I have always wanted to work on a project involving pair-programming.’
Try to avoid negative phrases in your interview. Instead, you can show interest and enthusiasm in performing things that you have not yet performed.
7. How would you complete a project from finish to start?
This question is considered a tricky full-stack developer interview question. You have to be careful and thoughtful while answering this question. With the help of this question, the interviewer can interpret your competency. Use your knowledge and experience when answering this question. Explain in-depth with clarity about your strategy about how you can start and then finish a project. Talk in detail about your design, tools and workflow. You can also cite an example if you have worked on any such project previously.
8. Explain CORS.
CORS is an acronym for Cross-Origin Resource Sharing. It is a procedure that enables sharing of resources from different sources. It allows users to freely connect web scripts with external content of the original domain. With the help of CORS, there is better integration among various web services.
9. What is multithreading?
This full-stack developer interview question is related to the computer architectural knowledge of a full-stack developer. The multithreading process helps in improving the performance of the CPU. The method of multithreading involves executing multiple processes which the operating system can support. It enables a program to be managed by more than one user or numerous requests of the same user at a time.
10. What is continuous integration?
Continuous integration is a process of automation. It is a process especially designed and automated for testing. It supports the developers by efficiently deploying codes at the production time. The full-stack developers use this process to integrate codes multiple times a day. It helps in the identification and detection of errors at an early stage.
11. What is an inversion of control?
The interviewers ask this question to check the understanding of the design patterns of the candidate. Though Inversion of Control (IoC) is a broad term, it is used by the full-stack developer to design a pattern that can decouple layers and components in a system. It is the opposite of conventional control. In IoC, a generic control flux is infused in the custom-written portions of a computer program.
12. What is long polling?
Long polling is a method that helps in surpassing data from the server to the client. Long polling helps in creating a stable server connection without using WebSocket. In other words, when the customer sends a request to the server, the server holds the request until it gets the data or information for the client. In this pattern, the server does not return an empty file if it does not know. Instead, the server will wait till it gets new information.
13. What are the responsibilities of a Full-stack Developer?
You can expect this question among the full-stack developer interview questions that the interviewer can ask. You can read the job description of a full-stack developer to understand and prepare your answer for this question. Some of the important responsibilities of a full-stack developer are:
- Writing code for various servers using PHP, ASP, Python, etc.
- Coding a database like SQL.
- Developing the architecture of a front-end website.
- Developing back-end software.
- Working on web design features.
- Creating functionality between servers and databases.
- Mentoring front-end developers.
- Solving technological problems.
- Keeping up to date with new technology.
As a front-end developer, you will be responsible for front-end and back-end procedures. You are also going to be responsible for architecture, pattern, database, clients, servers, and devices.
When you answer this question, show confidence, and give an impression that you are ready to undertake these responsibilities as a front-end developer.
14. How would you deal with an inefficiency found in someone else’s code?
The interviewer will test your ability to handle flaws, attention to detail, and teamwork with this question. You can be creative while answering this question. You have to demonstrate that you have high-quality standards and can maintain a 100% error-free work environment. But you also have to show that you can be a good mentor and give positive or constructive feedback to your team members. You have to portray that you can be relaxed under pressure and make the right decisions without compromising the quality of work. The interviewer would be asking you many technical interview questions. But he is also going to test your soft skills. You have to show that you are competent in both areas.
15. Which is the most significant error you have made during your projects?
It is both a technical interview question as well as a soft-skill question. When answering this question, be confident and frank with the interviewer. Do not say that you never made a mistake. It is not a hypothetical question. You are going to make mistakes while programming but you must learn from your mistakes. And this is what you have to demonstrate to your interviewer. You can talk about your error, how you identified it, and what measures you took to correct it. After that, also tell your interviewer about your learning and experience from that error. You can also tell how you ensure that you deliver error-free work by paying attention to detail and rechecking your work.
16. What is the difference between GraphQL and REST?
This question is considered one of the most difficult full-stack developer interview questions. The main difference between both APIs is that REST is a network-based software architecture idea while GraphQL is a query language API. REST is a traditional API, and GraphQL is a new API.
17. Discuss the new trends in the Full-stack development world.
Before appearing for your full-stack developer interview, you can update yourself with all the latest news and trends related to your field. The technological world keeps on revolving and every day there is something new. Therefore, to keep up with your competitors, you need to be up to date constantly. And this is going to be tested by the interviewers in your full-stack developer interview. Also, this is going to test your interest in learning and growing in the field.
18. What other skills are necessary as a full-stack developer other than technical skills?
You need to prepare for soft skills questions and technical interview questions. The interviewer is going to evaluate you on your soft skills as well. By directly asking you this question, the interviewer tests your capabilities and understanding of the job requirements. Some of the common soft skills required for the role of a full-stack developer are:
- Problem-solving skills
- Decision-making skills
- Mentoring skills
- Team player
- Communication skills
- Time management skills
- Adaptability skills
- Attentiveness skills
You can also refer to the job description provided by your potential employer. You can pick up keywords from the description and use them in your answers.
19. Do you know about design patterns?
It is an important full-stack developer interview question. You can demonstrate your knowledge and experience to your potential employers while answering this question. You can show your ability to detect errors in codes and web applications. You can convince your potential employer that you understand the importance of quality and error-free work and you have the experience to deliver it.
20. What do you prefer: management or execution?
You have to be completely honest with your interviewer while answering this question. The interviewer is checking your interest and competency for the available job role. Of course, you would have to take up a management role someday to grow in any organization. But the interviewer is checking whether you are interested in taking up management now or would you like to work on technical areas for a while. The interviewer needs to know so that he can assess your suitability with their requirements. It is equally essential for you to determine the needs of the organization with your personal goals. For example, suppose the organization does not have any open position for management for a few years while you want to take up a managerial place shortly. In that case, the job is not suitable for you. There will be several other factors that both you and your potential employer need to consider before selecting you for the job role.
21. Give an example of your project.
It is an opportunity for you to show off your best achievement as a full-stack developer. You can talk about your best work to date and explain everything about it from scratch to its completion. Also, you can talk about any awards or recognition you have achieved for your work. You can tell your interviewer about all the appreciation and feedback you received for your project. You can use this opportunity to impress your potential employers.
You can prepare for technical interview questions as well as non-technical interview questions. Your knowledge must be up to date and thorough. Try to revise your class and work notes before appearing for your full-stack developer interview. You also must read the job description given by the recruiters carefully and try to use the keywords mentioned in your answers.
Be confident in answering your questions. If you forget something, do not let that stop you from answering the asked question. Try to talk about the topic generally. If you are unaware of any answer, apologize and request your interviewer for the next question. Try to be honest and transparent while answering the questions. And lastly, dress up formally and smartly for your full-stack developer interview.
The above full-stack developer interview questions are the most commonly asked. However, please prepare thoroughly for your interview. The interviewer can ask you other questions as well. The list of questions covers questions for both the freshers and the experienced professionals. It also covers both technical interview questions and non-technical interview questions as well.