EPAM Systems Interview Questions, Process, and Tips

Q1. What is hoisting,closure,event loop?
Ans. 
Hoisting, closure, and event loop are key concepts in JavaScript.
• Hoisting is the JavaScript behavior where variable and function declarations are moved to the top of their containing scope.

• Closure is the combination of a function bundled together with references to its surrounding state (lexical environment).

• Event loop is a mechanism that allows JavaScript to perform non-blocking operations by offloading tasks to the b
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Q2. Use of unsubscribe in angular and practical benefit of onDestroy?
Ans. 
Unsubscribe in Angular is used to clean up resources and prevent memory leaks. ngOnDestroy is a lifecycle hook that is called when a component is destroyed.
• Unsubscribe is used to prevent memory leaks by unsubscribing from observables when a component is destroyed.

• onDestroy is a lifecycle hook in Angular that is called when a component is destroyed, allowing for cleanup tasks to be performed.

• Practical benefit of using o...read more
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Q1. What are singleton classes
Ans. 
Singleton classes are classes that can only have one instance created throughout the program.
• Singleton classes have a private constructor to prevent multiple instances.

• They typically provide a static method to access the single instance.

• Commonly used for logging, database connections, and configuration settings.

• Example: Logger class in a software application.
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Q2. What is difference between comparator and comparable
Ans. 
Comparator is an interface used to sort objects, while Comparable is an interface used to define natural ordering of objects.
• Comparator is used to define custom sorting logic for objects, while Comparable is used to define natural ordering based on a class's implementation of compareTo() method.

• Comparator can be used to sort objects of different classes, while Comparable is used to sort objects of the same class.

• Exampl...read more
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Q3. What iS rest api?
Ans. 
REST API stands for Representational State Transfer Application Programming Interface, which is a set of rules and conventions for building and interacting with web services.
• REST API is a type of web service that allows communication between different systems over the internet.

• It uses standard HTTP methods like GET, POST, PUT, DELETE to perform operations on resources.

• REST APIs typically return data in JSON or XML form...read more
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Q1. 1.) Question on java topics including collections, multithreading, jvm memory management. 2.) spring boot questions. 3.) Two coding questions. a.) one is simple string problem. b.) merging two sorted array...read more
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Q1. 1.) design patterns and clean code practices. 2.) one coding question. add two numbers represented by two arrays in reverse order.
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Q1. Hardcore technical questions
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Q1. Technical interview
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Q1. Epam culture fit check
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Q1. Just about yourself and projects in detail
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Leetcode medium and hard

Normal basic aptitude

Be confident and speak about new examples .

Q1. Asked dbms, oops, trees , bst
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Q1. Tell me about yourself
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Q2. Puzzle question or story question
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