EPAM Systems Backend Developer Interview Questions, Process, and Tips

Q1. Write MySQL query to find employee with 2nd Highest salary
Ans. 
Use MySQL query with ORDER BY and LIMIT to find employee with 2nd highest salary.
• Use ORDER BY salary DESC to sort salaries in descending order

• Use LIMIT 1,1 to skip the highest salary and get the second highest salary
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Q2. What is branch in git
Ans. 
A branch in git is a separate line of development that allows you to work on features or fixes without affecting the main codebase.
• Branches allow for parallel development

• They can be created, switched between, merged, and deleted

• Common branches include master, develop, feature branches, and release branches
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Online coding test with spring boot rest API and a java problem solving.

Q1. Design a REST API
Ans. 
Design a REST API for a backend Java developer
• Define the resources and endpoints

• Use HTTP methods like GET, POST, PUT, DELETE

• Implement authentication and authorization

• Use JSON for data exchange

• Include error handling and status codes
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Q2. Provided a list of string with names. and the result should be with a map of the name as key and number of vovels as value. Use Java stream API only.
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Q1. Event loop in Node.js
Ans. 
Event loop in Node.js manages asynchronous operations by executing callback functions when certain events occur.
• Event loop is responsible for handling I/O operations and executing callbacks.

• It allows Node.js to perform non-blocking operations efficiently.

• Event loop continuously checks the event queue for new events to process.

• Example: setTimeout function in Node.js uses event loop to schedule the callback function to b
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Q2. Process.nextTick vs SetIntermediate
Ans. 
process.nextTick is used to defer the execution of a callback function until the next iteration of the event loop, while SetImmediate is used to execute a callback function immediately after the current event loop.
• process.nextTick is more efficient for executing code asynchronously in the same phase of the event loop.

• SetImmediate is better suited for executing code asynchronously in the next iteration of the event loop...read more
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Q1. Tell me about your self ?
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Q2. Why should we hire you?
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Q1. Why should we hire you?
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Q1. Self introduction
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Basic English grammar

Q1. Basic questions
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Q1. Self Introduction about yourself
Ans. 
I am a Backend Associate with experience in developing and maintaining server-side applications.
• Proficient in programming languages like Java and Python

• Experience in working with databases like MySQL and MongoDB

• Familiar with RESTful APIs and microservices architecture

• Strong problem-solving and debugging skills

• Ability to work in a team and collaborate effectively
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Q1. How much you know about who's your admire person in your life ?
Ans. 
My admired person in life is my mother.
• My mother has always been my source of inspiration and support.

• She has taught me the values of hard work, perseverance, and kindness.

• Her selflessness and dedication to her family and community are admirable.

• She has overcome numerous challenges and always remains positive.

• I strive to be like her in both my personal and professional life.
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Q1. How much you have experienced, specify about your experience
Ans. 
I have 3 years of experience in backend development.
• 3 years of experience in backend development

• Proficient in programming languages like Java and Python

• Experience with databases like MySQL and MongoDB

• Familiarity with RESTful APIs and web services

• Knowledge of version control systems like Git
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Q1. Do you have all document like your graduation and experience certificate
Ans. 
Yes, I have all the required documents.
• I have my graduation certificate from XYZ University.

• I also have experience certificates from my previous employers.

• I can provide these documents upon request.
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