10 essential full-stack developer interview questions and answers for 2023

Are you a full-stack developer looking to branch out your career? Or, are you a recruiter looking out for brilliant full-stack developers? If the answer is yes, you have come to the right place. This list of carefully picked full-stack developer interview questions can help you to ace your full-stack developer interview, regardless of whether you are a full-stack developer or a recruiter looking for one.

Last updated on May 19, 2022

In a world where technological advancements happen every day, catching up with such a high pace might be extremely difficult. Providing a near-perfect user experience without any compromise with the efficiency of the code run in the backend is now a necessity. Full-stack developers, developers who handle both the front and back ends of a website, are one of the most demanded positions, as every establishment now needs an outstanding full-stack developer. Therefore, a full-stack developer interview is extremely challenging, as the full-stack developer questions can be extremely difficult to answer. In fact, curating a full-stack developer interview is not easy either.

Have no worries; this carefully selected list of the 10 most frequently asked full-stack developer questions is here to help you, regardless of whether you are a candidate or a recruiter. Hire the best talent for your company or prepare to crack your full-stack interview; these 10 full-stack interview questions will come in handy!

Full-stack developer interview questions and answers


As a Full-stack developer, list down your favorite technologies that you like to leverage and tell us why they are your favorites.
This full-stack developer interview question aims to gauge your knowledge and how well-versed you are with different types of technologies. When you answer, make sure you add your personal experience linked with the particular language/languages. In a full-stack developer interview, talking about your projects will help you a lot. The following is what a full-stack developer must introduce: - **Programming Languages:** A full-stack developer must be fluent in many programming languages, such as Java, Python, Ruby, C++, and others. Based on the programming language, one must be familiar with various approaches to plan, develop, implement, and test the project. - **Front-end:** Knowledge of front-end technologies such as HTML5, CSS3, Angular, and others is required. Understanding third-party libraries like jQuery provide additional benefits. - **Frameworks:** Proficiency with development frameworks such as Spring, Spring Boot, MyBatis, Django, Hibernate and others. - **Databases:** You should have an idea regarding at least one database. It is enough if you are familiar with either MySQL, Oracle, or MongoDB. - **Design Ability:** Hands-on experience in popular design skills, such as UI and UX design, is also required.


Talk about MVC and MVP. Are they similar to each other? If not, mention the differences.
**Model View Controller (MVC)** MVC is an architectural paradigm for creating Java Enterprise Applications. It divides a program into three logical parts: Model, View, and Controller. It isolates the display layer (View component) from the business-specific logic (Model component). Data and logic relating to it are contained in the model components. Model objects are shown within the user interface using the View component. The Controller accepts the input and invokes model objects based on the handler mapping. It also transfers model objects to views to show output within the view layer. **Model View Presenter (MVP)** Model View Presenter is an acronym for Model View Presenter. The MVC architectural pattern inspired it. It adds an extra layer to the architectural pattern (known as indirection) that divides the View and Controller into View and Presenter. A Presenter takes the position of the Controller. In MVC, it's on the same level as View. It includes the View's UI business logic. The Presenter receives the invocations straight from the View. It keeps the action (events) going between the View and the Model. The View is not directly communicated with by the Presenter. It connects with the user via a user interface. No, MVC and MVP are not similar at all. The most significant difference between MVC and MVP architectural patterns is that with MVC, the data from the Model is not sent to the View via the Controller. It simply instructs the View to obtain data from the Model. The View and Model layers are linked together in the MVP architectural design. The data from the Model is received by the presenter, who then transmits it to the View to display. Another distinction is that MVC is more commonly used in web frameworks, whereas MVP is more commonly used in app development.


What is load time? Mention five different ways how to reduce the load time of a web application.
The average time it takes for a page to load on your screen is called page load time. It's computed from the beginning (when you click on a page link or write in a Web address) to the end (when the page is fully loaded in the browser). There are many ways to reduce and optimize the load time of an application. They are: - By optimizing the image size and format - By avoiding redirects - Minimizing the HTTP requests - Placing the script reference at the bottom - Externally placing JavaScript and CSS


Explain what a callback is in JavaScript.
A Callback Function is a parameter for another function. The callback function executes inside the function it was supplied into. You can use Callback Functions in JavaScript both synchronously and asynchronously. The Node's application programming interfaces are all built so that callbacks are supported.


Explain two-phases commit (2PC) in the database.
When an error circumstance occurs, a two-phase commit (2PC) is a feature of transaction processing systems that allows databases to restore to their pre-transaction state. The two-phase commit technique ensures that either all of the databases are updated, or none of them are updated. As a consequence, the databases are kept in sync.


How is a blue/green deployment different from a rolling deployment? Explain.
In Blue/Green Deployment, you have two complete ecosystems. The Blue environment is now operational, whereas the Green environment is the one you want to upgrade to. When you change the environment from blue to green, the traffic is redirected to your new green environment. You can delete or save your old blue environment as a backup until the green environment is formed. In Rolling Deployment, there is only one complete environment. Before being relocated to another subset, the code is deployed in a subset of the same environment's instances.


List down the various disadvantages of GraphQL.
- You must transmit the queries from the client; you may send strings if you want greater convenience and caching, but you need to use a client library. - You must define the schema ahead of time, therefore more effort is required before seeing any results. - You must have a GraphQL endpoint on your server, which is more new libraries that you may not be familiar with. - Graphql queries take up more space than visiting a REST API. - The server must perform additional processing to parse the query and check the arguments.


Explain whether null and undefined are similar in JavaScript or not.
No, null is not at all similar to undefined in JavaScript. **Null:** A null value has been assigned to a variable. When used with the typeof operator, the result is an object. Because the programmer uses null to represent a variable with no value, we should never set a variable to null. It's worth noting that JavaScript will never set the value to null by default. **Undefined:** When a variable is declared but not given a value, it is considered undefined. It is possible that a variable doesn't exist at all. When used with the typeof operator, the outcome is undefined. In JSON, it isn't valid.


What do you understand by MEAN Stack?
MEAN stack is a user-friendly free and open-source JavaScript framework for creating dynamic web pages and online apps. The MEAN stack has the advantage of running only one language, JavaScript, on all application layers, making it more efficient. MEAN stack comprises the following: **Database:** MongoDB **Web Framework:** Express.js **Frontend Framework:** AngularJS **Server Platform:** Node.js


Mention the different ways how to avoid deadlock in Java.
Deadlock occurs when two or more threads attempt to access the same resources simultaneously in Java. These threads will eventually be unable to access the resource and will remain to wait indefinitely. There are several ways to avoid deadlock. Some of them are: **By Avoiding Unnecessary Locks:** We should only use locks on members who need them. Locks are used unnecessarily, resulting in a stalemate. It is suggested that you utilize a data structure that is not locked. Keep your code as lock-free as possible. Instead of utilizing a synchronized ArrayList, consider using a ConcurrentLinkedQueue. **By Avoiding Nested Locks:** Another technique to avoid deadlock is to provide a lock to many threads if one thread has already been given a lock. We can't assign a lock to many threads because of this. **By Using the Thread.join() method:** We can have a deadlock if two threads wait eternally for each other to finish. It's usually advisable to use join with the maximum time you want to wait for the thread to finish if a thread has to wait for another thread to finish. **Utilize Lock Ordering:** Each lock should have a number value assigned to it. Obtain the locks with a lower numeric value before acquiring the locks with a higher numeric value. **Lock Time-out:** We may also specify how long it takes for a thread to get a lock. If a thread fails to obtain a lock, it must wait a certain amount of time before attempting to acquire a lock again.

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Wrapping up

You have now gained the ability to answer or formulate any full-stack interview question. The questions above have covered all the basics, fundamentals, and advanced topics necessary for a full-stack developer interview. However, this is not the end. Just knowing how to answer/prepare full-stack interview questions is not enough, as the second most important tool needed in your arsenal is soft skills and team management. As a candidate looking for a full-stack developer job, to maximize your chances of cracking any technical interview you need to make sure you are ready to answer any soft skills questions. You need to mention your projects, be they collaborative or personal, and talk about how well you manage your time and team. As a recruiter, it is imperative that you find the perfect candidate who is an ideal fit for your company.

If you think you are ready to answer the technical full-stack developer interview questions and the soft-skills questions, you can apply at Turing. If you want to add brilliant gems as full-stack developers to your team, message Turing today.

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