EPAM Systems Software Developer Interview Questions and Answers

Coding and aptitude coding and aptitude with technical questions

Q1. Tell me about the oops concepts
Ans. 
Object-oriented programming concepts that focus on classes and objects
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class)

• Inheritance: Ability of a class to inherit properties and behavior from another class

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the complex implementation details and showing only the necessary features
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Q2. Details about your project
Ans. 
Developed a web-based project management tool for tracking tasks and deadlines.
• Used HTML, CSS, and JavaScript for front-end development

• Utilized Node.js and MongoDB for back-end development

• Implemented user authentication and authorization features
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Q1. React MCQ questions were asked
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Q2. JS MCQ questions were asked
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Q1. What is call apply bind in JS?
Ans. 
call, apply, and bind are methods in JavaScript used to manipulate the context of a function.
• call - calls a function with a given 'this' value and arguments provided individually.

• apply - calls a function with a given 'this' value and arguments provided as an array.

• bind - creates a new function that, when called, has its 'this' keyword set to the provided value.
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Q2. Output questions based on promises in JS
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Understanding JavaScript promises is crucial for handling asynchronous operations effectively.
• A promise represents a value that may be available now, or in the future, or never.

• Promises have three states: pending, fulfilled, and rejected.

• Example: const myPromise = new Promise((resolve, reject) => { /* async code */ });

• You can handle promise results using .then() for fulfilled and .catch() for rejected.

• Example: myPro...read more
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Aptitude was quite good it has mcq

They have given 3 coding questions

Q1. They asked questions on java
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Q2. Coding questions
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Q1. About your self
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Q2. Projects on resume
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Q1. Sort the array of strings in the lexicographical and length-wise
Ans. 
Sort array of strings lexicographically and by length
• Use built-in sorting functions in programming languages like sort() in Python or Arrays.sort() in Java

• For lexicographical sorting, use default comparison function

• For length-wise sorting, create a custom comparison function based on string length
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