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Top Full Stack Developer Interview Questions and Answers

28 Sep 2023

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The demand for full stack developers is high. As more organizations require the development of websites and apps, the value of skilled full stack developers is rising. If you have an interview and you are not sure about the top Full Stack interview questions, then you are at the right place. Since you already know how to become a full stack developer, let's see all the important interview questions and answers you need to know to clear the interview. 

In the blog, we'll see interview questions for freshers and experienced full stack professionals. Let's start the guide with interview questions for freshers. 

Top Full Stack Interview Questions For Freshers 

Q1. What is full stack development, according to your understanding?

Full stack development is handling and managing a complete website or web application, which simultaneously includes the front-end and back-end sides. It includes user interfaces, server-side, data layers, and other work. 

Q2. What does a full stack developer do? 

A full stack developer is a professional capable of working on the client as well as the server side of the software. In addition to this, they're also experts in working with multiple databases for smooth query functions. 

Q3. What are some of the basic programming languages required by full stack developers?

Since this is a very high-skilled profession, full stack developers programming languages and tools are huge in number. Some essential programming languages are Python, JavaScript, C++, HTML, CSS, SQL, MongoDB, etc. 

 Q4. Explain Pair Programming. 

Pair programming is the working of two programmers simultaneously on one system. One programmer works on the keyboard, writing all the codes. Another programmer navigates the system and proofreads the lines of code to catch any errors. The roles of each programmer are shifted from time to time. This method increases the efficiency and quality of code. 

Q5. What are some of the basic ways of increasing the website's efficiency? 

Since your core job is to work on websites and applications, you're expected to know about them and how minor changes can increase their efficiency, even if this question is a little bit about SEO. 

Basic practices that can improve the efficiency are:

Not using duplicate codes 

Less DNS Lookup

Improved browser caching 

Reduce the amount of unnecessary images 

No URL redirect

Q6. How do you stay connected with the latest trends going on in the market?

The role of full stack developer is filled with multiple responsibilities. Since they know about numerous programming languages, staying updated with the trends is a little tricky. Tell them what you do to know about the latest trends. You can tell them about your group with other professionals where members keep sending updated news about the market. Or about online courses you take every 3-4 months to see what's happening in multiple programming languages. 

Q7. What do you understand by DevOps?

DevOps is the latest concept in the IT industry that focuses on increasing the collaboration between the development and operations teams to increase product/service delivery much faster. 

Q8. What do you know about CI?

CI stands for continuous integration, where developers and coders update codes into shared software where there are automated tools. These tools check the new code's correctness before applying it to the system. In this way, the errors and bugs, if any, in the code can be detected at an early stage. 

Q9. What is Observer?

A behavioral design pattern used in software engineering is the observer pattern. It establishes a one-to-many relationship between objects in which the subject keeps track of its observers and calls one of their methods to notify them of any state changes. By using this pattern, objects can maintain synchronization and updates with the state changes of another object without being inextricably linked to it.

Q10. What do you know about multithreading?

Multiprogramming is a strategy where one program is divided into multiple threads. Each thread is capable of performing its tasks. This concept increases the efficiency of the project by allowing the application to perform various tasks together. The process requires careful execution to avoid conflicts between different threads. 

These are some of the basic interview questions that can be asked of freshers. Let's see the types of questions that are generally asked of experienced professionals. 

Top Full Stack Interview Questions For Experienced Professionals 

Q11. Explain d/b HTML, CSS, and JavaScript.

Hypertext markup language is used to create and structure web content, while cascading style sheets help manage user-end parts like presentation, layout, and design. Lastly, JavaScript helps in adding interactive structure to web applications. All these programming languages are worked together to create a complete website. 

Q12. How will you make a website mobile responsive?

To make a website more mobile responsive, we can use front-end programming languages to manage the design options, such as using CSS to manage the layout according to the screen size. Along with this, testing the website on multiple browsers and operating systems before launching is also important. 

Q13. Discuss the significance of database indexing.

Indexing databases is essential for improving query performance. Data structures called indexes enable quick access to particular rows in database tables. They speed up response times by lowering the number of rows a database engine must scan when running queries. For big, frequently visited databases, proper indexing is crucial.

Q14. In JavaScript, how would you describe the hoisting concept?

As part of the compilation process, variable and function declarations are hoisted to the top of the contained scope in JavaScript. So, even before you declare variables and functions in your code, you can use them. However, initialization are not hoisted; only declarations are.  

Q15. What is RESTful API, exactly?

Representational state transfer is the full form of REST. An application programming interface (API or web API), usually referred to as a RESTful API, is an architectural approach that employs HTTP requests to gather and handle data. This information can be used to read, delete, create, and perform operations on services using the POST, GET, DELETE, and OUT data types.  

Q16. What do you understand by Callback Hell?

A prevalent anti-pattern in asynchronous programming code (code with numerous functions running simultaneously) is called Callback Hell, sometimes called the Pyramid of Doom. This colloquial phrase refers to many nested "if" statements or functions. 

In short, callback hell is a circumstance with numerous asynchronous functions. Employing callback functions results in code that is challenging to comprehend and maintain and looks like a pyramid. 

Q17. Describe Progressive Web Apps (PWAs) in general.

Web apps called Progressive Web Apps (PWAs) provide a proper app-like experience within a web browser. They offer advantages, including push alerts, offline functioning, and quicker load times. PWAs are responsive, enabling them to function correctly across various screens and devices. They increase user retention and engagement, which makes them an advantageous option for contemporary web construction. 

These were some essential interview questions that were most likely to be asked. Now, we've curated some tips that you must consider before going for the interview. Let's see what these tips are. 

Tips For Going To Full Stack Interview Round 

Preparing for a full-stack developer interview is crucial to landing your chosen employment. Take into account the following advice to succeed in the interview round:
Developers working across the full stack must be adept at front-end and back-end platforms. Review HTML, CSS, JavaScript, and your preferred back-end language in great detail. Make sure you can cross the gap between these sectors with ease. Create a broad portfolio that highlights your skills. Include projects that show off your capacity to plan, create, and implement entire apps, emphasizing both front-end and back-end work. A diverse portfolio will demonstrate your adaptability.  

Be well-prepared for technical questions that test your coding and problem-solving skills. Follow the most recent developments in web development trends and technology. Candidates who are enthusiastic about learning and adjusting to novel techniques and methods are valued by interviewers. Expect to be questioned about your prior experiences, collaborative efforts, and problem-solving techniques. Use the STAR approach (Situation, Task, Action, Result) for a clear structure.  
You can improve your chances of acquiring the job you want by using these suggestions during the interview stage to show off your abilities and readiness to succeed as a full-stack developer. 


The hiring managers never expect the candidates to know everything about the field. They search for candidates who are most likely to be prone to learn new things and are curious to stay updated with the trends. We hope the list of these important questions helps you prepare for your big interview day. All the best, and good luck with your full stack developer interview.

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