EPAM Systems Senior Software Engineer Interview Questions and Answers for Experienced

Redux library HLD
JavaScript basic
leetcode 75 questions

Q1. What is hoisting,closure,event loop?
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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...read more
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Q2. Use of unsubscribe in angular and practical benefit of onDestroy?
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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. 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. Solid principles
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Leetcode style medium level questions

Q1. Mostly on System Design Fundamentals and Java Concepts
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Q1. Frontend Round involved Machine Coding
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Q1. Managerial Round consists of behavioural questions
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Q1. Salary negotiations and about the company culture
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Q1. Output list of palindrome strings from a given string.
Ans. 
Output list of palindrome strings from a given string.
• Iterate through each substring in the given string and check if it is a palindrome.

• Use two pointers approach to check if a substring is a palindrome.

• Store palindrome substrings in an array and return the array.
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Q2. Given a matrix, when you encounter a 0, make all the elements in the corresponding row and column to 0.
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Given a matrix, replace rows and columns with 0 when encountering a 0.
• Iterate through the matrix and store the row and column indices of 0s in separate sets.

• Iterate through the sets and update the corresponding rows and columns to 0.
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Q3. Working of Kafka, the flow of a message, using partitions, load balancing with Consumers.
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Kafka is a distributed streaming platform that allows for the flow of messages through topics, partitions, and consumers.
• Kafka is a distributed streaming platform that allows producers to publish messages to topics.

• Topics are divided into partitions, which allow for parallel processing and scalability.

• Producers can specify a key for a message, which determines the partition to which the message will be sent.

• Consumers c...read more
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Q4. Microservice based system design.
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Q5. Design patterns - Factory
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