EPAM Systems Interview Questions, Process, and Tips

Coding test online having 30 questions

Q1. What is window function in sql
Ans. 
Window function in SQL is used to perform calculations across a set of table rows related to the current row.
• Window functions are applied to a set of rows related to the current row, known as a window frame.

• They can be used to calculate running totals, ranks, averages, and more.

• Examples of window functions include ROW_NUMBER(), RANK(), SUM(), AVG(), and LEAD().
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Q2. How spark procss data in parlell.
Ans. 
Spark processes data in parallel using its distributed computing framework.
• Spark divides data into partitions and processes each partition independently.

• Tasks are executed in parallel across multiple nodes in a cluster.

• Spark uses in-memory processing to speed up data processing.

• Data is processed lazily, allowing for optimizations like pipelining.

• Spark DAG (Directed Acyclic Graph) scheduler optimizes task execution.

• Exam...read more
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Q1. What is ETl testing
Ans. 
ETL testing is the process of validating and verifying data extraction, transformation, and loading in a data warehouse or data mart.
• ETL testing involves ensuring data is extracted correctly from the source systems

• It also involves verifying that data is transformed accurately according to business rules

• Lastly, ETL testing checks that the loaded data is accurate and complete in the target database

• Examples include valida...read more
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Q2. What is the data warehouse
Ans. 
A data warehouse is a centralized repository that stores structured and unstructured data from multiple sources for analysis and reporting.
• Data warehouses are designed for querying and analysis rather than transaction processing.

• They often contain historical data that is used for creating reports and data analysis.

• Data warehouses typically use ETL processes to extract, transform, and load data from various sources.

• Exam...read more
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Q1. About current project roles and responsibilities
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Q2. Project management detailed stages
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Q1. 1.Core Java 2. Java 8 3.Basic java programs on array and string 4. Selenium 4 5.CI/CD
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Q1. Same as asked in round 1
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Q1. Why do you apply for this position?
Ans. 
I am passionate about coding and eager to learn and grow as a developer.
• Passionate about coding and technology

• Eager to learn and grow as a developer

• Excited about the opportunity to work in a junior developer role
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Q2. Tell me about yourself, what did you do about this area?
Ans. 
I am a junior developer with experience in front-end development using HTML, CSS, and JavaScript.
• I have completed multiple projects using HTML, CSS, and JavaScript

• I have experience working with responsive design and cross-browser compatibility

• I am familiar with version control systems like Git
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Q3. From when, do you work on this area?
Ans. 
I have been working in this area for 2 years, starting from my internship in college.
• Started working in this area during my internship in college

• Have gained 2 years of experience in this field

• Continuously learning and improving my skills in this area
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