JPMorgan Chase & Co. Senior Developer Interview Questions and Answers

Medium level round with moderate tough questions

Q1. Medium of stream of numbers
Ans. 
The medium of a stream of numbers is the value that appears most frequently in the stream.
• Calculate the frequency of each number in the stream

• Keep track of the number with the highest frequency

• Return the number with the highest frequency as the medium
Answered by AI
Add your answer
Q2. Core Java questions
Add your answer

There were three coding questions.

Q1. Could you provide a thorough explanation of the project?
Add your answer
Q2. OOps Concepts and question from the technical subjects
Add your answer
Q3. Why Spring Boot
Add your answer
Q4. JWT Authentication
Add your answer
Q5. Docker and Kubernetes
Add your answer

Q1. Scenario based questions
Add your answer
Q2. What is lazy loading?
Ans. 
Lazy loading is a technique used in web development to defer loading non-essential resources until they are needed.
• Lazy loading helps improve page load times by only loading necessary resources initially.

• It is commonly used in Angular applications to load modules, components, or routes on demand.

• Lazy loading can be implemented using Angular's loadChildren property in the routing configuration.
Answered by AI
Add your answer
Q3. What is switchMap?
Ans. 
switchMap is an operator in RxJS that projects each source value to an Observable which is merged in the output Observable.
• switchMap is used to switch to a new Observable whenever the source Observable emits a new value.

• It cancels the previous Observable subscription when a new value is emitted.

• Example: source$.pipe(switchMap(value => new Observable(value)))
Answered by AI
Add your answer
Q4. Observables and promises
Add your answer
Q5. Difference between ?? and ?:
Ans. 
?? is the nullish coalescing operator, while ? is the optional chaining operator in Angular.
• ?? is used to provide a default value when a variable is null or undefined.

• ? is used to safely access nested properties of an object without causing errors if a property is null or undefined.
Answered by AI
Add your answer
Q6. What is services, modules, decorators, directive?
Ans. 
Services, modules, decorators, and directives are key concepts in Angular development.
• Services: Reusable code that can be injected into components to provide specific functionality.

• Modules: Containers for different parts of an Angular application, including components, services, and directives.

• Decorators: Functions that modify classes or properties in Angular, used for adding metadata or behavior to components.

• Directiv...read more
Answered by AI
Add your answer
Q7. What is multicasting ?
Ans. 
Multicasting is the process of sending data from one source to multiple destinations simultaneously.
• In multicasting, a single sender sends data to a group of receivers at the same time.

• It is commonly used in streaming services where one server sends data to multiple clients.

• Multicasting is more efficient than unicasting (one-to-one communication) when sending data to multiple recipients.
Answered by AI
Add your answer
Q8. What is RxJS ?
Ans. 
RxJS is a library for reactive programming using Observables to handle asynchronous data streams.
• RxJS stands for Reactive Extensions for JavaScript.

• It allows you to work with asynchronous data streams and events.

• Operators like map, filter, mergeMap, switchMap, etc., can be used to manipulate and combine streams.

• Example: Using RxJS to handle HTTP requests in Angular applications.
Answered by AI
Add your answer

Q1. They grind u in javascript,typescript
Add your answer
Q2. Html css, angular
Add your answer
Q3. Deep preparation needed
Add your answer

Q1. Basic questions about sql and PLSQL topics
Add your answer
Q2. Scenario based questions and write few sql queries
Add your answer

Q1. Performance tuning related questions
Add your answer
Q2. Explain project details
Add your answer

Q1. Project Architecture
Add your answer

Q1. Informatica tech questions
Add your answer

MCQ test consisting of 70 mcqs in 75 minutes from aptitude english and cs fundamentals. If cleared next paper 2 coding qs medium level

Q1. Two sum leetcode problem
Add your answer
Q2. What problems you faced in your project
Ans. 
I faced challenges with integrating third-party APIs and debugging complex logic.
• Difficulty in understanding and implementing third-party APIs

• Issues with data synchronization between different systems

• Troubleshooting complex logic errors

• Managing dependencies and version conflicts

• Time constraints affecting problem-solving
Answered by AI
Add your answer

DP graphs strings it was good

Q1. Reverse a linkded list
Ans. 
Reverse a linked list by changing the direction of pointers
• Start with three pointers: current, previous, and next

• Iterate through the list, updating pointers to reverse the direction

• Return the new head of the reversed list
Answered by AI
Add your answer
Q2. Print fibonacci series
Ans. 
The Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.
• Start with two variables initialized to 0 and 1

• Loop through desired number of iterations, adding the previous two numbers to get the next number

• Print or store each number in the series
Answered by AI
Add your answer