EPAM Systems Lead Engineer Interview Questions and Answers

Q1. Remove duplicates in an array
Ans. 
Use a hash set to remove duplicates in an array of strings
• Create a hash set to store unique elements

• Iterate through the array and add each element to the hash set

• Convert the hash set back to an array to get the unique elements
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Q2. What is react virtual DOM
Ans. 
React virtual DOM is a lightweight copy of the actual DOM, used for efficient updates and rendering in React applications.
• Virtual DOM is a concept where a lightweight copy of the actual DOM is created in memory.

• React uses virtual DOM to efficiently update and render components without directly manipulating the actual DOM.

• When changes are made to the virtual DOM, React calculates the most efficient way to update the act...read more
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Q3. React hooks with example
Ans. 
React hooks are functions that let you use state and other React features without writing a class.
• React hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that allows you to perform side effects in functional components.

• useContext() is a hook that allows you to use the con...read more
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Q1. Questions on core java concepts
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Q2. Questions on SQL and Springboot
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Q1. Questions on Collection framework.
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Q2. Questions on Springboot and core java
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Q1. Scenario based question
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Q2. Stream API questions
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Q1. How are partitions assigned in Kafka?
Ans. 
Partitions in Kafka are assigned based on the number of partitions specified when creating a topic.
• Partitions are assigned to brokers in a round-robin fashion.

• The number of partitions should be a multiple of the number of brokers to ensure even distribution.

• Reassignment of partitions can be done manually using the Kafka Reassign Partitions tool.
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Q2. Have you ever use terraform?
Ans. 
Yes, I have experience using Terraform for infrastructure as code.
• I have used Terraform to provision and manage infrastructure resources in a declarative manner.

• I have written Terraform configuration files to define the desired state of infrastructure components.

• I have used Terraform to automate the deployment of cloud resources such as virtual machines, storage, and networking.

• I have experience with Terraform modules ...read more
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Q1. How to critical things in your project
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Q1. Expected Facilities
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2 program level medium

Q1. All related to core Java and spring boot
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Q1. Salary discussion
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Q1. Work experience
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Q1. Work experience
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Q1. Personality questions
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