EPAM Systems Interview Questions, Process, and Tips

Q1. SOLID Principles, Spring Framework, Stream APIs from Java 8, OOPS
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Q2. Microservices, Factory and Builder design pattern, Mocking private methods in junit test cases
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Q3. Find the triplets in an array whose sum is 0 , complexity - O(n2)
Ans. 
Use nested loops to iterate through array and find triplets with sum 0.
• Iterate through array with two nested loops to find all possible pairs.

• For each pair, check if there is a third element that completes the triplet with sum 0.

• Store the triplets found in a separate array.
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Q4. Implementation of hashmap in Java 8, Bean lifecycle, difference between @Component and @Service, Front Controller, difference between PUT & PATCH, Authentication in REST APIs, how to disable junit test cas...read more
Ans. 
The interview question covers topics like hashmap implementation in Java 8, bean lifecycle, annotations in Spring framework, HTTP methods, REST API authentication, and disabling junit test cases during deployment.
• HashMap in Java 8 uses an array of linked lists to store key-value pairs, with the hash code of the key determining the index in the array.

• Bean lifecycle in Spring framework involves initialization and destruc...read more
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Q1. Java basics / java 8 , java programs , testing methodology
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Q2. Sql queries, api questions
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Dsa,oops,seo,reactjs,node js

Q1. What is seo and how it was used
Ans. 
SEO stands for Search Engine Optimization, which is the practice of increasing the quantity and quality of traffic to your website through organic search engine results.
• SEO involves optimizing your website content, meta tags, and backlinks to improve its visibility on search engines like Google.

• Keywords play a crucial role in SEO, as they help search engines understand the relevance of your content to users' search que...read more
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Q2. What is event loop
Ans. 
Event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking for and handling events.
• Event loop is commonly used in JavaScript to handle asynchronous operations.

• It allows for non-blocking I/O operations by delegating tasks to the operating system.

• Event loop continuously checks the event queue for new events and executes them in a sequential manner.

• Example: setTimeout ...read more
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Q1. What is difference between state object and state?
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State object is a specific instance of a state, while state is a general concept representing the condition of a system.
• State object is a concrete representation of a state in a program, containing specific values and properties.

• State is an abstract concept that defines the overall condition or status of a system.

• In iOS development, state object could refer to an instance of a class representing the current state of a ...read more
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Q2. Lazy properties
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Q1. Java Coding( Hashmap based),Interfaces and Abstrct classes,OOPs concepts and their usage in framework,Java 8 features
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Q2. GIT PR Process,Jenkins,RestAssured basics
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Q1. Framework Design,Parallel Execution
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Q2. Internal working of Hashmaps,Singleton Design pattern
Ans. 
Hashmaps store key-value pairs using hashing for fast retrieval. Singleton pattern ensures only one instance of a class exists.
• Hashmaps use hashing to map keys to values for efficient retrieval

• Singleton pattern restricts a class to have only one instance and provides a global point of access to it

• Internal working of Hashmaps involves hashing the key to determine the index where the value is stored

• Singleton pattern can ...read more
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Q1. Salary negotiation
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Q2. Notice Period Discussion
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Q1. Touched all concepts of java, spring boot, microservices
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Q2. Writing code using java8
Ans. 
Using Java 8 features to write efficient and concise code.
• Utilize lambda expressions for functional programming

• Use streams for processing collections in a more declarative way

• Leverage default methods in interfaces for backward compatibility

• Explore the new Date and Time API for improved handling of dates and times
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Situational, what you will do if some certain situation happens

Q1. Details about company, and payslip discussion
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