Full Stack Developer Interview Questions

If you are looking for Top Full Stack Developer Interview Questions you are at right place. We at iStudyNew curated Frequently Asked Questions on Full Stack Development with clear explanation. In this article you’re going to learn Best Full Stack Developer Interview Questions and Answers.

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Full Stack Developer Interview Questions Answers [Updated 2020]

1. What are the most important skills required for a full stack developer?

2. What is Multithreading?

Ans. Multi-threading is defined as a process of executing multiple threads simultaneously. To increase the speed of the system multi-threading enables a process to generate multiple threads. It mainly defines the ability of the CPU or an operating system like how they manage more than one user or a thread or a request at a time. Multi-threaded applications are known as Concurrency in Java. Finally, the Multi-threading process leads to maximum utilization of the CPU.

3. Explain Continuous Integration?

Ans: Continuous Integration is defined as a technique that is used to automate various operations of applications like build, test, and deploy. When the Software projects are created by the whole team or an individual the continuous integration is mainly used as a hub to ensure that the important aspects like unit tests are automated. Continuous Integration plays a key role in deploying codes during the time of production. Furthermore, Developers make use of this technique several times a day to integrate codes continuously. 

4. What is CORS in full-stack development?

Ans: CORS is abbreviated as Cross-Origin Resource Sharing. It is a technique that mainly allows resources to be shared among different origins. The CORS also allows you to access the web resources on various domains. Web Scripts can also be integrated openly. 

5. What is Pair-programming?

Ans: Pair Programming is an agile software development method that provides a platform for the two programmers to work together at one workstation. Among those two programmers, one writes the code and the other observes or navigates through each line of code as it is written. In this technique, the roles of the two programmers switch frequently. 

6. What is Inversion of control?

Ans: Inversion of Control is a commonly used term by software developers in full-stack web development. Eventually, it is considered a pattern by software developers and they use it for decoupling components and layers in a system.

7. How to decrease the load time of web applications?

Ans. The following are the ways to decrease the load time of the web applications.

  • Compress Images
  • Use proper headers
  • Usage if Caching Plugins
  • Caching Implementation
  • Minify JS and CSS
  • Minimize HTTP Requests
  • Optimizing Images
  • Reduce Server Response Time
  • Run a Compression Audit

8. What is long polling?

Ans: Long polling is a traditional polling technique or a development pattern its main function is to emulate the data push from a server to client. This polling plays a key role in returning a response to the client rather than an empty label when it requests information from the server.

9. What is an Application server in Full stack web development?

Ans: The application server plays a key role in designing and managing both client-side and server-side applications.

10. What are the tools required to test your code’s functionality?

Ans. CSS, JavaScript, Java, AngularJS, Android,  MongoDB, React js, Python, VueJS, RubyonRails

11. What is the main process of the Bridge Pattern?

Ans: Bridge Pattern is a Structural Design Pattern. The main purpose of the Bridge Pattern is to decouple an abstraction from its implementation so that both the abstraction and implementation class can vary independently from each other.

Bridge pattern in Full Stack Developing
                                          Bridge Pattern in Full Stack Development

The decoupling between the abstract class and implementation class is performed by providing a bridge structure between them.

12. Explain the difference between REST and GraphQL?

Ans. Both REST and GraphQL are mainly used to design the working of an API and how web applications access data from APIs. REST API in full-stack is mainly used to allow you to create an interface programmatically to build customized workflows and integrations. The REST API simplified the work of the developers with it’s the standard approach. Whereas, the GraphQL enables better performance on the backend and faster product iterations on the frontend. GraphQL is mostly preferred than REST API because it provides better performance with its resolvers, schemas, and queries.

Advanced Full Stack Developer Interview Questions

13. Essential skills that full-stack developers must have?

15. Explain Callback Hell?

16. Explain about the Observer pattern?

Ans: Observer Pattern comes under the behavioral pattern category. In Observer pattern we make use of three classes and they are Client, Observer, and Client.

Observer Pattern in Full Stack Development
                                         Observer Pattern in Full Stack Development

The observer pattern is mainly used when there are one-to-many relationships between different objects. If one object is modified its dependent objects are notified automatically.

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