EPAM Systems Senior Software Engineer Interview Questions, Process, and Tips

Q1. How to create and handle complex primary key in Spring Data JPA
Ans. 
Complex primary keys in Spring Data JPA can be created using @EmbeddedId or @IdClass annotations
• Use @EmbeddedId annotation to create a composite primary key using an embeddable class

• Use @IdClass annotation to create a composite primary key using a separate class for the key fields

• Implement equals() and hashCode() methods in the embeddable or separate key class for proper comparison and hashing
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Q1. Bean scopes in Spring boot
Ans. 
Bean scopes in Spring Boot determine the lifecycle and visibility of beans.
• Singleton scope: Default scope, only one instance per Spring container

• Prototype scope: New instance created each time bean is requested

• Request scope: Bean created once per HTTP request

• Session scope: Bean created once per HTTP session

• Application scope: Bean created once per ServletContext
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Q1. What are your salary expectations?
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Q2. Share details of your previous job.
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Q3. Why are you looking for a change?
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Q4. Where do you see yourself in 5 years?
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Q5. Tell me about yourself.
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Q1. Basic JavaScript and React questions
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Q2. Medium level coding question to test your coding skills
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Q1. Tell me about yourself.
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Q2. Will you be accepting the job offer
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Find if IP address belongs to ipv4 or ipv6

Discuss about your life importance if the earth is ending within few hours so that you can be on a limit seated spaceship

Q1. Java VM, Java Strings, Collections, Threads
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Q2. Git, Personal Projects
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Q1. Find duplicate element from array
Ans. 
Find duplicate element from array of strings
• Iterate through the array and store each element in a HashSet

• If an element is already in the HashSet, it is a duplicate
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Q1. Mule 4 vs mule 3
Ans. 
Mule 4 offers improved performance, enhanced error handling, and better support for modern integration patterns compared to Mule 3.
• Mule 4 has a more streamlined and efficient runtime engine.

• Mule 4 provides better error handling capabilities with the introduction of Try scope.

• Mule 4 supports more modern integration patterns like reactive programming.

• Mule 4 offers improved dataweave capabilities for data transformation.

• M...read more
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Q2. Design pattern mule 4
Ans. 
Design patterns in Mule 4 help in structuring and organizing code for better maintainability and scalability.
• Mule 4 supports various design patterns such as scatter-gather, choice, splitter, aggregator, etc.

• Design patterns help in solving common integration challenges and promoting best practices.

• For example, using scatter-gather pattern to send a request to multiple services in parallel and aggregate the responses.
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Q3. Life cycle API mule 4
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Q1. Mule 4 design api test
Ans. 
Designing API tests for Mule 4
• Use MUnit for testing Mule 4 APIs

• Write test cases to cover all possible scenarios

• Mock external dependencies for isolated testing

• Use assertions to validate API responses
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Q2. Batch job mule 4 process
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