JPMorgan Chase & Co. Senior Software Engineer Interview Questions, Process, and Tips

Q1. Internal working of string intern
Ans. 
String intern is a method in Java that returns a canonical representation of a string object.
• String intern() method returns a canonical representation for the string object.

• If a string with the same contents is already in the string pool, then it returns the reference to that string.

• If not present, it adds the string to the pool and returns the reference.
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Q1. Microservice architecture
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Hackerrank - Coding test

Assignment for angular

Test discussion with work flow and concept understanding

Q1. Salary discussion
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Q1. Accumulators in spark python sum of odd places in list Partition and bucketing
Ans. 
Spark accumulators are used to accumulate values across multiple tasks in a distributed manner.
• Accumulators are used to accumulate values across multiple tasks in a distributed manner

• They are used to implement counters and sums in Spark

• Accumulators are read-only variables that can only be updated by an associative and commutative operation

• Partitioning is the process of dividing a large dataset into smaller, more manage...read more
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Q1. SQL median query in spark Python user defined exceptions Dataframe - RDD & RDD - Dataframe conversion
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Q1. Reason for change Things to look forward in your next company
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Coding skills dynamic programming

Q1. Coding skills dynamic programming
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Q1. Microservices spring boot
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Technical coding skills

Q1. Hashcode and equals contract
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Q2. Springboot annotations
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Q1. Current project details
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Q2. Explain Solid principles
Ans. 
SOLID principles are a set of five design principles that help in creating maintainable and scalable software applications.
• S - Single Responsibility Principle (SRP)

• O - Open-Closed Principle (OCP)

• L - Liskov Substitution Principle (LSP)

• I - Interface Segregation Principle (ISP)

• D - Dependency Inversion Principle (DIP)
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 1 very simple coding problem followed by some questions from Java and Spring.

Q1. 
Excel Column Number Conversion
Given a column title as it appears in an Excel sheet, your task is to return its corresponding column number.
Example:
Input:
S = "AB"
Output:
28
Explanation:
The seq...read more
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Q2. What is a lambda expression in Java, and how does it relate to a functional interface?
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Q3. What are Java 8 streams?
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Q4. What do you understand by autowiring in Spring Boot, and can you name the different modes of it?
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Q5. What does the @SpringBootApplication annotation do internally?
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Q6. What are the basic annotations that Spring Boot offers?
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Round duration - 60 Minutes
Round difficulty - Medium

This round focused more on Multithreading concepts from Java and also some core concepts from OOPS.

Q1. What is a thread in Java?
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Q2. What are the start() and run() methods of the Thread class in Java?
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Q3. What is the difference between the Thread class and the Runnable interface when creating a thread in Java?
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Q4. What is the difference between an abstract class and an interface in OOP?
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Q5. What is the garbage collector in Java?
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Q6. Can you explain the SOLID principles in Object-Oriented Design?
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Round duration - 60 minutes
Round difficulty - Medium

This was a System Design Round where I was asked a LLD question to design a URL Shortener followed by a very standard question of LRU Cache. Overall this round went well and the interviewer was also quite satisfied by my answers.

Q1. Design a URL shortener.
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Q2. 
LRU Cache Design Question
Design a data structure for a Least Recently Used (LRU) cache that supports the following operations:
1. get(key) - Return the value of the key if it exists in the cache; otherw...read more
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