EPAM Systems Senior Software Engineer Interview Questions and Answers

Online coding test of about 1 hour

Q1. Flatten array pollyfill
Ans. 
A polyfill to flatten a nested array into a single-level array.
• Use recursion to handle nested arrays. Example: flatten([1, [2, [3, 4]], 5]) returns [1, 2, 3, 4, 5].

• Utilize Array.prototype.reduce to accumulate values. Example: [[1, 2], [3, 4]].reduce((acc, val) => acc.concat(val), []) returns [1, 2, 3, 4].

• Check if an element is an array using Array.isArray(). Example: if (Array.isArray(item)) { ... }

• Consider using th...read more
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Q1. Event loop question
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Q2. How to secure a web app
Ans. 
Securing a web app involves implementing various security measures to protect against threats and vulnerabilities.
• Use HTTPS to encrypt data transmitted between the client and server

• Implement input validation to prevent SQL injection and XSS attacks

• Use strong authentication mechanisms like multi-factor authentication

• Regularly update software and patches to fix security vulnerabilities

• Implement security headers like Cont...read more
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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
Ans. 
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
Ans. 
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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