EPAM Systems Interview Questions, Process, and Tips

Q1. Spring boot annotations
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Q2. Java 8 features. what you have used in your project
Ans. 
Used Java 8 features like lambda expressions, streams, and optional in my project.
• Utilized lambda expressions to write concise and readable code.

• Made use of streams for processing collections in a functional style.

• Implemented optional to handle potentially null values more effectively.
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Q3. Hash map internal working
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HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap uses hashing to store and retrieve key-value pairs.

• It uses an array of linked lists to handle collisions.

• The internal working involves calculating the hash code of keys to determine the index in the array.
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Q4. REST API principles
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REST API principles are a set of guidelines for designing APIs that adhere to the principles of REST.
• Use HTTP methods (GET, POST, PUT, DELETE) to perform CRUD operations

• Use resource URIs to represent entities

• Statelessness - each request from a client must contain all the information necessary to process the request

• Use hypermedia links to allow clients to navigate the API dynamically
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Q5. POST VS PUT VS PATCH
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POST is used to create a new resource, PUT is used to update an existing resource, and PATCH is used to partially update an existing resource.
• POST is used to create a new resource on the server.

• PUT is used to update an existing resource on the server. It replaces the entire resource with the new one.

• PATCH is used to partially update an existing resource on the server. It only updates the specified fields.
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Q6. Questions on OOPS Concepts.
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It will be the screening round

Q1. Tech one on one round to assess tech skills in details with internal working
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Q1. Another round with Architect where they will be asking techno managerial questions
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Q1. Salary discussion
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Inheritance based design question.

Q1. Discussed about Data structures. And then the OOPS concepts
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Q1. Just the general behavioral questions and questions about EPAM.
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Need to solve the use case and prepare code

Q1. Relevant questions on real time scenarios
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Q1. Many questions they asked
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Q1. Asked on Java basics and then they asked on microservives and spring boot questions
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Q1. Previous Project experiences.
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Q1. Why does pega suggest not to have framework layer while designing application stack ?
Ans. 
Pega suggests not having a framework layer in the application stack to avoid unnecessary complexity and maintainability issues.
• Pega recommends a flat application stack to simplify the design and development process.

• Having a framework layer can introduce unnecessary complexity and increase the learning curve for developers.

• A flat application stack allows for easier maintenance and upgrades as there are no dependencies o...read more
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Q2. What are design pattern in case management?
Ans. 
Design patterns are reusable solutions to common problems in case management.
• Factory pattern for creating cases

• Singleton pattern for managing case data

• Observer pattern for notifying stakeholders of case updates

• Decorator pattern for adding additional functionality to cases

• Strategy pattern for selecting appropriate case handling strategies
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Q3. Why do we need Data Types
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Data types are necessary for organizing and manipulating data in a structured manner.
• Data types define the type of data that can be stored in a variable or object

• They help in memory allocation and optimization

• They enable type checking and prevent errors

• Different data types have different properties and methods

• Examples of data types include integers, strings, booleans, arrays, and objects
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Q4. How to configure OKTA security for a connect rest method
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Configure OKTA security for a connect rest method
• Create an OKTA account and configure the security settings

• Generate an API token in OKTA and use it in the REST method

• Add the OKTA authorization header to the REST request

• Test the REST method with OKTA authentication
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Q5. Difference between Job scheduler and queue processor
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Job scheduler schedules jobs to run at specific times while queue processor processes jobs in a queue.
• Job scheduler is time-based while queue processor is event-based

• Job scheduler is used for scheduling tasks like backups, updates, etc.

• Queue processor is used for processing tasks like sending emails, processing orders, etc.

• Job scheduler can be used to trigger a queue processor to process a job

• Queue processor can handle...read more
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Q6. Similarity and difference between agents and job schedulers
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Agents and job schedulers are both used for automation but have different functions.
• Agents are software components that perform tasks on behalf of a user or another program.

• Job schedulers are used to automate the execution of tasks at specific times or intervals.

• Agents can be used to monitor and manage systems, while job schedulers are used to automate repetitive tasks.

• Agents can be proactive in identifying and resolvi...read more
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