JPMorgan Chase & Co. Full Stack Developer Interview Questions, Process, and Tips

Round duration - 60 Minutes
Round difficulty - Medium

This round had questions mainly from Java 8 and its important features followed by some questions from Spring Boot.

Q1. What are Java 8 streams?
Ans. 
Java 8 streams are a sequence of elements that can be processed in parallel or sequentially.
• Streams provide a functional programming approach to process collections in Java.

• They allow for concise and expressive code.

• Streams can be used to filter, map, reduce, and perform other operations on data.

• Example: List numbers = Arrays.asList(1, 2, 3, 4, 5); numbers.stream().filter(n -> n % 2 == 0).forEach(System.out::println);

• T...read more
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Q2. Write a Java 8 program to iterate through a Stream using the forEach method.
Ans. 
A Java 8 program to iterate a Stream using the forEach method.
• Create a Stream object from a collection or array

• Use the forEach method to perform an action on each element of the Stream

• The action can be a lambda expression or a method reference
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Q3. How does Spring Boot work?
Ans. 
Spring Boot is a framework that simplifies the development of Java applications by providing default configurations and dependencies.
• Spring Boot eliminates the need for manual configuration by providing sensible defaults.

• It uses an embedded server, such as Tomcat or Jetty, to run the application.

• Spring Boot automatically configures the application based on the dependencies added to the project.

• It promotes convention ov...read more
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Q4. What is dependency injection?
Ans. 
Dependency Injection is a design pattern where the dependencies of a class are provided externally rather than being created within the class itself.
• Dependency Injection helps in achieving loose coupling between classes.

• It allows for easier testing and maintenance of code.

• In Spring Boot, dependencies are injected using annotations like @Autowired.

• Example: In a Spring Boot application, if a class requires a database con...read more
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Q5. Can you explain the @RestController annotation in Spring Boot?
Ans. 
The @RestController annotation in Spring Boot is used to mark a class as a RESTful controller.
• It combines the @Controller and @ResponseBody annotations.

• It eliminates the need for annotating each method with @ResponseBody.

• It automatically serializes the return value of the methods into JSON/XML response.

• It is commonly used to build RESTful web services in Spring Boot.
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Q6. What are the different methods of session management in Servlets?
Ans. 
Different methods of session management in Servlet
• Cookies

• URL Rewriting

• Hidden Form Fields

• Session Tracking API

• HTTP Session
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Round duration - 60 Minutes
Round difficulty - Medium

This was a preety much mixed round ranging questions from Java , MVC to DBMS , Web Security and API Design. More emphasis was given on the fundamentals of the subject rather than the advanced topics.

Q1. What is CORS in MVC and how does it work?
Ans. 
CORS in MVC is Cross-Origin Resource Sharing, a mechanism that allows restricted resources on a web page to be requested from another domain.
• CORS is a security feature implemented in web browsers to prevent cross-origin requests by default.

• It works by adding specific HTTP headers to the server's response, indicating which origins are allowed to access the resources.

• In MVC, CORS can be configured using the 'EnableCors' ...read more
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Q2. Can you explain in brief the role of different MVC components?
Ans. 
MVC components include Model, View, and Controller. Model represents data and business logic, View displays the data, and Controller handles user input and updates the Model and View.
• Model: Represents data and business logic

• View: Displays the data to the user

• Controller: Handles user input and updates the Model and View
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Q3. What is the difference between a clustered index and a non-clustered index?
Ans. 
Clustered index determines the physical order of data in a table, while non-clustered index has a separate structure.
• Clustered index determines the physical order of data in a table

• Non-clustered index has a separate structure that includes a copy of the indexed columns and a pointer to the actual data

• A table can have only one clustered index, but multiple non-clustered indexes

• Clustered index is faster for retrieving la...read more
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Q4. What is SQL injection?
Ans. 
SQL injection is a web security vulnerability that allows an attacker to manipulate a database query to execute unauthorized actions.
• SQL injection occurs when user-supplied data is not properly validated or sanitized before being used in an SQL query.

• Attackers can exploit this vulnerability to bypass authentication, retrieve sensitive data, modify or delete data, or even execute arbitrary commands.

• To prevent SQL inject...read more
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Q5. What are the advantages of web services?
Ans. 
Web services offer advantages such as interoperability, scalability, reusability, and platform independence.
• Interoperability: Web services allow different applications to communicate and share data regardless of the programming languages or platforms they are built on.

• Scalability: Web services can handle a large number of requests and can be easily scaled up or down to meet changing demands.

• Reusability: Web services pr...read more
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Round duration - 45 Minutes
Round difficulty - Medium

This round started with some questions from Frontend Web Development primarily from HTML and CSS followed by some questions from DevOps and Git. The interviewer was quite satisfied by my answers and overall this round went preety well.

Q1. How can you optimize the loading of website assets?
Ans. 
Optimize website assets loading by minimizing file sizes, leveraging caching, and using asynchronous loading.
• Minimize file sizes by compressing images, minifying CSS and JavaScript files

• Leverage caching by setting appropriate cache headers and using a content delivery network (CDN)

• Use asynchronous loading techniques such as lazy loading, deferred loading, and async/defer attributes

• Combine and bundle multiple files to r...read more
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Q2. What are the new tags for media elements introduced in HTML5?
Ans. 
New tags in Media Elements in HTML5 include <audio> and <video>.
• <audio> tag for audio content

• <video> tag for video content

• Attributes like controls, autoplay, loop, etc. can be used with these tags
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Q3. Can you explain a use case for Docker?
Ans. 
Docker is a containerization platform that allows developers to package applications with their dependencies for easy deployment and scalability.
• Docker enables developers to create lightweight, isolated containers that can run on any operating system.

• It simplifies the deployment process by ensuring that the application and its dependencies are bundled together, eliminating compatibility issues.

• Docker allows for easy sc...read more
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Q4. What is the difference between 'git pull' and 'git fetch'?
Ans. 
Git pull combines git fetch and git merge, while git fetch only downloads new data from a remote repository.
• Git pull is used to update the local branch with the latest changes from the remote repository.

• Git fetch only downloads new data from the remote repository, but does not integrate it into the local branch.

• Git pull is a combination of git fetch and git merge commands.

• Git fetch is useful to see what changes have be...read more
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Q1. Core Java questions and get max o(n) from stack.
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