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

Q1. SOLID Principles, Spring Framework, Stream APIs from Java 8, OOPS
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Q2. Microservices, Factory and Builder design pattern, Mocking private methods in junit test cases
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Q3. Find the triplets in an array whose sum is 0 , complexity - O(n2)
Ans. 
Use nested loops to iterate through array and find triplets with sum 0.
• Iterate through array with two nested loops to find all possible pairs.

• For each pair, check if there is a third element that completes the triplet with sum 0.

• Store the triplets found in a separate array.
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Q4. Implementation of hashmap in Java 8, Bean lifecycle, difference between @Component and @Service, Front Controller, difference between PUT & PATCH, Authentication in REST APIs, how to disable junit test cas...read more
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The interview question covers topics like hashmap implementation in Java 8, bean lifecycle, annotations in Spring framework, HTTP methods, REST API authentication, and disabling junit test cases during deployment.
• HashMap in Java 8 uses an array of linked lists to store key-value pairs, with the hash code of the key determining the index in the array.

• Bean lifecycle in Spring framework involves initialization and destruc...read more
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Q1. Touched all concepts of java, spring boot, microservices
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Q2. Writing code using java8
Ans. 
Using Java 8 features to write efficient and concise code.
• Utilize lambda expressions for functional programming

• Use streams for processing collections in a more declarative way

• Leverage default methods in interfaces for backward compatibility

• Explore the new Date and Time API for improved handling of dates and times
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Situational, what you will do if some certain situation happens

Q1. Details about company, and payslip discussion
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Q1. Collections Framework
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Q2. Stream APIs Java 8
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Q3. Microservices : Circuit Breaker, CQRS
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Q1. Factory & Builder Design Pattern
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Factory & Builder Design Patterns are creational patterns used in software development to create objects.
• Factory Design Pattern is used to create objects without specifying the exact class of object that will be created.

• Builder Design Pattern is used to construct complex objects step by step.

• Factory pattern uses a factory method to create objects, while Builder pattern uses a builder class to construct objects.

• Factory ...read more
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Q2. Spring Boot annotations
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Q1. Internals of c# asp net and expect twisted questions
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Q2. Coding questions related to stacks
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Q3. Sql optimisation
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Q4. Entity framework
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Q1. Senior on different GCP services
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Q1. Different senarios on different gcp services
Ans. 
Different scenarios on different GCP services
• Scenario 1: Using Cloud Storage for storing and accessing large amounts of data

• Scenario 2: Utilizing Cloud Functions for serverless computing and event-driven applications

• Scenario 3: Implementing Cloud SQL for managing relational databases in the cloud
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Q1. Discussion on salary expectations
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Q1. React, JS, HTML,CSS
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Q2. Deep dive in those topic
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Some random question in Javascript ex: Closure,this,debounce, and custom hooks

Q1. Regarding team handling, testing, quality control
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