EPAM Systems Interview Questions, Process, and Tips

Q1. Difference between implicit and explicit wait.
Ans. 
Implicit wait is set globally for all elements, while explicit wait is applied only to specific elements.
• Implicit wait is set using driver.manage().timeouts().implicitlyWait() method

• Explicit wait is set using WebDriverWait class with ExpectedConditions

• Implicit wait is applied globally to all elements, while explicit wait is applied only to specific elements

• Implicit wait is used to wait for elements to load before perfo...read more
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Q2. What is POM and Page Objects .
Ans. 
POM stands for Page Object Model, a design pattern used in test automation to create reusable and maintainable code by separating test scripts from web elements.
• POM helps in creating a clear separation between test code and page-specific code

• Each web page is represented as a separate class in POM

• Page Objects contain the locators and methods to interact with the elements on that page

• POM promotes code reusability and mai
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Q3. Code to create class , test methods and create object and call them.
Ans. 
Create a class, test methods, create object, and call them in code.
• Create a class with properties and methods

• Write test methods to test the functionality of the class

• Instantiate an object of the class and call its methods
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Q1. What projects or technologies I'm interested in?
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Q2. How I describe my seniority ?
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Q3. What was the most important work experience for you and why?
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Q1. How can we adapt the frontend to different view of devices?
Ans. 
Responsive design using media queries and flexible layouts to adapt frontend to different devices.
• Use media queries in CSS to apply different styles based on screen size

• Utilize responsive frameworks like Bootstrap or Foundation for pre-built responsive components

• Implement flexible layouts using percentage-based widths and max-width properties

• Optimize images for different screen resolutions using srcset and sizes attrib...read more
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Q2. What is a closure in Javascript?
Ans. 
A closure is a function that has access to its own scope, as well as the outer scope in which it was defined.
• A closure allows a function to access variables from an outer function even after the outer function has finished executing.

• Closures are commonly used to create private variables and functions in JavaScript.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console
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Q3. What are the advantages of using Typescript? mention your favorite features
Ans. 
Typescript offers advantages like static typing, improved code quality, better tooling support, and easier refactoring.
• Static typing helps catch errors at compile time

• Improved code quality due to type checking

• Better tooling support with features like code navigation and auto-completion

• Easier refactoring with the help of type annotations

• Faster development with enhanced IDE support
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Q4. Can you describe some Architectural Patterns ?
Ans. 
Architectural patterns are reusable solutions to common problems in software architecture.
• MVC (Model-View-Controller) - Separates an application into three main components: the model, the view, and the controller.

• MVVM (Model-View-ViewModel) - Similar to MVC but with a ViewModel layer that manages the state and behavior of the view.

• Flux - Unidirectional data flow pattern commonly used with React applications.

• Microservic...read more
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Q5. Can you describe some Design Patterns ?
Ans. 
Design patterns are reusable solutions to common problems in software design.
• Creational Patterns: Singleton, Factory, Builder

• Structural Patterns: Adapter, Decorator, Facade

• Behavioral Patterns: Observer, Strategy, Command
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Q6. Do you configured some part of a CI/CD pipeline?
Ans. 
Yes, I have configured various parts of CI/CD pipelines.
• I have set up automated builds using tools like Jenkins or GitLab CI.

• I have configured automated testing processes within the pipeline.

• I have integrated deployment scripts to automatically deploy code to different environments.

• I have set up notifications for build status and deployment success/failure.

• I have worked on optimizing and improving the efficiency of CI/
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Q7. Can you mention some popular hacker attacks?(xxs, sql injection, etc)
Ans. 
Some popular hacker attacks include XSS (Cross-Site Scripting) and SQL Injection.
• XSS (Cross-Site Scripting) - attackers inject malicious scripts into web pages viewed by other users

• SQL Injection - attackers insert malicious SQL code into input fields to manipulate database queries
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Q8. Solve a React problem, the goal is not trigger re-renders of a siblings components from a parent node, but avoiding the memo, useMemo, or useCallback react utilities. You can modify the original structure
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Q9. Describe the benefits of using SSR (server side rendering)
Ans. 
SSR improves SEO, performance, and initial load time of web applications.
• Improves SEO by serving fully rendered HTML to search engine crawlers

• Enhances performance by reducing time to first paint and time to interactive

• Faster initial load time for users, especially on slower network connections

• Better support for social media crawlers and web scrapers

• Enables content to be visible to users even if JavaScript is disabled
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Q10. How can we fetch our data ? (fetch api, axios, forms, websockets, graphql, trpc, etc)
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Q11. Name performance techniques. It's a wide topic so prepared to explain in detail
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Q12. Do you know how to measure web performance? (lighthouse with it's scores measures)
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Q13. Resolve a Leetcode problem -Merge two intervals.
Ans. 
Merge two intervals by sorting and iterating through the intervals.
• Sort the intervals based on the start value.

• Iterate through the intervals and merge overlapping intervals.

• Return the merged intervals.
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Q1. Contents of test plan and stratergy
Ans. 
Test plan and strategy outline the approach for testing a software application.
• Test plan includes objectives, scope, resources, schedule, and risks.

• Test strategy defines testing approach, techniques, tools, and responsibilities.

• Both documents are essential for successful testing and quality assurance.

• Example: Test plan may include test cases, test scenarios, and test data.

• Example: Test strategy may outline automation t...read more
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Q2. Sql query to find unique records, what is truncate, abort,what are DML commands
Ans. 
SQL query to find unique records, truncate, abort, DML commands
• To find unique records in SQL, you can use the DISTINCT keyword in your SELECT statement.

• Truncate is a SQL command used to quickly delete all records from a table, but it cannot be rolled back.

• Abort is a command used to cancel a transaction in SQL.

• DML (Data Manipulation Language) commands in SQL include INSERT, UPDATE, DELETE.
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Q1. What is the process for finding the missing number from a list?
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Q2. What are some methods for optimizing Spark performance?
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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. Question around Servicenow Modules mentioned
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Q2. Team Management, Process Management Business Analysis
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Q3. Requirement Understanding and scenario based questions
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Q1. IT was a Client fitment round, Where the questions were related to Safe, Agile and ServiceNow
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Q1. Project Management, Business Analysis
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Q2. This round is important this will define your position in organising. Scheduling team will say its just a formality but please take this round very seriously else you will not get position you deserve
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Q1. Salary discussion and negotiation
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