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I applied via LinkedIn and was interviewed in Feb 2024. There were 3 interview rounds.
Epam Anywhere is a platform that connects remote tech professionals with global companies for project-based work.
Epam Anywhere is a platform created by Epam Systems, a global IT services company.
It allows remote tech professionals to work on project-based assignments for global companies.
Professionals can choose projects based on their skills and availability.
Companies can access a pool of talented professionals from a...
Git merge combines changes from different branches, while git rebase moves the current branch to the tip of another branch.
Git merge creates a new commit with the combined changes of the branches being merged.
Git rebase moves the current branch to the tip of another branch by replaying each commit on top of the other branch.
Git merge preserves the commit history of both branches, while git rebase rewrites the commit hi
Setting up a version control system involves choosing a system, creating a repository, adding files, committing changes, and collaborating with team members.
Choose a version control system like Git, SVN, or Mercurial.
Create a repository to store your project files.
Add files to the repository using commands like 'git add' or 'svn add'.
Commit changes to the repository with a message describing the changes using commands ...
Working tree, staging/index, and HEAD are different states in Git representing different versions of files.
Working tree is the current state of files in the project directory
Staging/index is the area where changes are prepared to be committed
HEAD points to the last commit on the current branch
Various authentication mechanisms include password-based, biometric, multi-factor, and OAuth.
Password-based authentication
Biometric authentication (e.g. fingerprint, facial recognition)
Multi-factor authentication (e.g. SMS code, token generator)
OAuth (Open Authorization) for third-party authentication
BDD stands for Behavior Driven Development. Cucumber is a BDD tool that uses Gherkin syntax. SpecFlow is a BDD tool for .NET.
BDD (Behavior Driven Development) is a software development approach that focuses on the behavior of the system.
Cucumber is a BDD tool that uses Gherkin syntax to write test scenarios in a human-readable format.
SpecFlow is a BDD tool specifically designed for .NET projects, allowing developers to...
Upcasting is casting a subclass object to a superclass reference. Downcasting is the opposite.
Upcasting is safe and implicit in OOP, as it involves casting a subclass object to a superclass reference.
Downcasting is not safe and requires explicit casting, as it involves casting a superclass reference to a subclass object.
Example: Animal animal = new Dog(); // Upcasting
Example: Dog dog = (Dog) animal; // Downcasting, req
HashMap is recommended due to better performance and allows null values, while HashTable is synchronized.
HashMap is not synchronized, so it is faster than HashTable for single-threaded applications.
HashMap allows null values and null keys, while HashTable does not.
HashMap is part of the Java Collections Framework, while HashTable is a legacy class.
Example: HashMap
Example: HashTab
Five basic items to jumpstart API Automation
Understand the API documentation
Select a suitable automation tool (e.g. Postman, SoapUI)
Set up a testing environment
Write test cases for API endpoints
Implement continuous integration for automated testing
Running test cases in parallel can be achieved by using tools like TestNG or JUnit.
Use TestNG or JUnit to create test suites that can run test cases in parallel
Configure the test suite to run test cases concurrently by setting the parallel attribute in the testng.xml file
Ensure that the test cases are independent of each other to avoid any conflicts during parallel execution
Log levels are used to categorize log messages based on their severity. Common levels include DEBUG, INFO, WARN, ERROR, and FATAL.
Log levels help in filtering and managing log messages based on their importance and severity.
Different log levels include DEBUG, INFO, WARN, ERROR, and FATAL, each indicating the severity of the message.
Log libraries like Log4j, Logback, and SLF4J are commonly used in projects to handle log...
Some common design patterns include Singleton, Factory, Observer, and Strategy patterns.
Singleton pattern ensures a class has only one instance and provides a global point of access to it.
Factory pattern creates objects without specifying the exact class of object that will be created.
Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified...
SOLID principles are a set of five design principles that help make software designs more understandable, flexible, and maintainable.
Single Responsibility Principle (SRP) - A class should have only one reason to change.
Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.
Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects o...
Types of testing include functional testing, non-functional testing, manual testing, automated testing, regression testing, and performance testing.
Functional testing: Testing the functionality of the software against the requirements.
Non-functional testing: Testing aspects like performance, usability, and security.
Manual testing: Testing performed manually by testers without the use of automation tools.
Automated testi...
Filter names starting with 'a' using LinQ expressions on a List
Use LinQ Where method with a lambda expression to filter names starting with 'a'.
Example: var filteredNames = lst.Where(name => name.StartsWith('a')).ToArray();
Jenkins is a popular open-source automation server used for continuous integration and continuous delivery of software projects.
Jenkins is used to automate the non-human part of the software development process, with continuous integration and facilitating technical aspects of continuous delivery.
It allows for easy configuration of pipelines to automate the build, test, and deployment processes.
Setting up a pipeline in...
Creating interface, abstract class, and implementing them in a new class with a common method
To create an interface in Java, use the 'interface' keyword and define the methods without implementation
To create an abstract class in Java, use the 'abstract' keyword before the class definition and can have both abstract and concrete methods
To implement an interface in a class, use the 'implements' keyword and provide implem...
To override a method in a child class, use the 'override' keyword in the child class method definition.
Use the 'override' keyword before the method signature in the child class.
The method in the child class must have the same name, return type, and parameters as the method in the parent class.
The overridden method in the child class can call the parent class method using 'base.MethodName()'.
Create a dictionary to store word frequency from a given string.
Split the string into words using space as delimiter
Iterate through the words and update the frequency in the dictionary
Handle case sensitivity and punctuation marks appropriately
Select projects a sequence of values into a new form, while SelectMany projects each element of a sequence to a sequence and flattens the resulting sequences into one sequence.
Select is used to transform each element of a sequence into a new form.
SelectMany is used to transform each element of a sequence into a sequence of values and then flattens those sequences into one sequence.
SelectMany is often used when working ...
Use Linq to create a dictionary with elements from a list as keys and their lengths as values.
Use ToDictionary method with element as key and element length as value
Use Select method to project each element to a KeyValuePair
Attributes used in Nunit for parallel execution include Parallelizable and MaxDegreeOfParallelism.
Parallelizable attribute is used to specify that a test fixture can be run in parallel with others
MaxDegreeOfParallelism attribute is used to specify the maximum number of threads to use for parallel execution
Stale element exception occurs when an element is no longer attached to the DOM.
Refresh the page and try to locate the element again
Use explicit wait to ensure the element is present and interactable before performing actions
Handle the exception using try-catch block to retry the operation
Avoid storing web elements in variables for a long time as they may become stale
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I applied via Approached by Company and was interviewed in Aug 2017. There were 5 interview rounds.
posted on 27 May 2024
Math, resizing, English
Java is a programming language, String is a data type for text, Thread is a unit of a process, Exception handling is managing errors.
Java is a popular programming language used for developing various applications.
String is a data type in Java used to store text.
Thread in Java is a unit of a process that can run concurrently with other threads.
Exception handling in Java is the process of managing errors that occur durin
Java program exception handling
I was interviewed before Oct 2022.
1h, HackRank, 3 algo problem
Medium leetcode question related to dp.
LLD round to create a cache library
Design a system similar to Paytm for online payments and transactions.
Implement user authentication and authorization for secure transactions
Develop a user-friendly interface for easy navigation and transactions
Integrate various payment options like credit/debit cards, net banking, UPI, and wallets
Implement a robust backend system to handle transactions and store user data securely
Design a URL shortener service to generate short URLs for long URLs.
Use a unique identifier for each long URL to generate a short URL.
Implement a mapping system to map short URLs to long URLs.
Consider implementing features like custom short URLs, expiration dates, and analytics.
Ensure the short URLs are unique and not easily guessable.
Optimize the service for performance and scalability.
Design a Notification Service for sending alerts to users.
Define types of notifications (email, SMS, push notifications)
Implement a system for users to subscribe/unsubscribe from notifications
Include a scheduling system for sending notifications at specific times
Consider implementing a notification history for users to view past alerts
I applied via Walk-in and was interviewed before Nov 2022. There were 4 interview rounds.
Reasoning, java, java script basics
I applied via Naukri.com and was interviewed before Apr 2023. There were 2 interview rounds.
SQL Questions based on subqueries.
I applied via LinkedIn and was interviewed in Jul 2024. There was 1 interview round.
I applied via Recruitment Consultant and was interviewed in Mar 2021. There were 3 interview rounds.
Find common ancestor of 2 nodes in a binary tree
Traverse the tree from root to both nodes and store the paths
Compare the paths to find the last common node
Use recursion to traverse the tree and find the common ancestor
To find the minimum element of a stack in O(1) time, maintain a separate stack for minimum values.
Create a separate stack to store minimum values
Push the minimum value onto the minimum stack every time a new value is pushed onto the main stack
Pop the minimum stack every time the main stack pops a value
The top of the minimum stack will always contain the minimum value
Sort a binary array of 0s and 1s and optimize the code.
Use two pointers approach to swap 0s and 1s
Avoid using sorting algorithms like bubble sort or selection sort
Use a single loop to traverse the array and swap elements
Use XOR operation to swap elements
Explaining Java HashMap internals and behavior when hashcode always returns 1.
HashMap uses hashcode to calculate the index of the bucket where the key-value pair will be stored.
If hashcode always returns 1, all key-value pairs will be stored in the same bucket resulting in poor performance.
In this case, HashMap will use a linked list to store multiple key-value pairs in the same bucket.
Retrieving a value from a HashMap...
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