EPAM Systems Senior Engineer Interview Questions and Answers

Q1. Python related libraries and SQL
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Q1. What is turbofan
Ans. 
A turbofan is a type of air-breathing jet engine that is widely used in aircraft propulsion.
• Consists of a fan at the front of the engine that compresses air and a core engine that burns fuel to produce thrust

• More fuel-efficient and quieter compared to traditional turbojet engines

• Commonly used in commercial airliners like Boeing 737 and Airbus A320
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Q2. Explain your assessment
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My assessment involves evaluating the current state of a project or system, identifying strengths and weaknesses, and providing recommendations for improvement.
• Assess current project/system

• Identify strengths and weaknesses

• Provide recommendations for improvement
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A backend service to be created for product management.

Q1. Logical implementation of set theory
Ans. 
Set theory is a branch of mathematical logic that studies sets, which are collections of objects.
• Set theory deals with the study of sets and their properties.

• Sets can be defined by listing their elements or by using set-builder notation.

• Operations on sets include union, intersection, and complement.

• Venn diagrams are often used to visualize relationships between sets.

• Set theory forms the foundation of many branches of m...read more
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Q2. Java features and details
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Q1. Reverse a String using Array
Ans. 
Reverse a string using array of characters
• Create an array of characters from the input string

• Use two pointers to swap characters at opposite ends of the array until they meet

• Join the characters in the array to form the reversed string
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Q2. Microservices vs Monilith
Ans. 
Microservices allow for modular, independent services while monolith is a single, cohesive unit.
• Microservices promote scalability and flexibility

• Monoliths are easier to develop and deploy initially

• Microservices can lead to more complex infrastructure and communication between services

• Monoliths can become difficult to maintain and scale as they grow

• Examples: Netflix uses microservices for their streaming platform, while...read more
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Q3. SQL query to get 3 max salary by group
Ans. 
SQL query to get 3 max salary by group
• Use the RANK() function to rank the salaries within each group

• Filter the results to only include rows where the rank is less than or equal to 3

• Order the results by group and salary in descending order
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Q4. CI CD process followed in last project
Ans. 
Implemented CI/CD process using Jenkins for automated builds, tests, and deployments.
• Utilized Jenkins for continuous integration and continuous deployment

• Automated build process triggered by code commits to version control

• Implemented automated testing to ensure code quality

• Deployed code to different environments based on predefined pipelines
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Q5. Major changes in Spring boot 3
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Major changes in Spring Boot 3 include support for Java 17, improved performance, and enhanced security features.
• Support for Java 17

• Improved performance optimizations

• Enhanced security features such as OAuth 2.1 support

• Updated dependencies and libraries
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Q1. TMAY, project work, tools
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Q2. What is your project
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Q3. Technology worked on
Ans. 
I have worked on various technologies including Java, Python, AWS, and Docker.
• Proficient in Java programming language and its frameworks like Spring and Hibernate

• Experience in developing and deploying applications on AWS cloud platform

• Familiarity with Python and its libraries like NumPy and Pandas

• Expertise in containerization using Docker and Kubernetes

• Hands-on experience in database technologies like MySQL and MongoDB
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Q1. Project you worked on
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Q2. Domain of project you worked
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Q1. Experience on Bobj __________
Ans. 
I have extensive experience working with Bobj, including designing and implementing reports, dashboards, and universes.
• Designed and developed complex reports using Bobj Web Intelligence

• Created and maintained universes using Bobj Universe Designer

• Developed dashboards using Bobj Dashboard Designer

• Worked with Bobj InfoView to schedule and distribute reports

• Provided technical support to end-users for Bobj-related issues
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Q2. Integration from Hana to Bo along with query filter usage
Ans. 
Integration of Hana to Bo with query filter usage
• Use SAP HANA Smart Data Access to connect HANA to BO

• Create a query in BO with filters to retrieve data from HANA

• Use the query as a data source for BO reports

• Example: SELECT * FROM "HANA_SCHEMA"."TABLE_NAME" WHERE "COLUMN_NAME" = 'FILTER_VALUE'

• Example: Use BO Query Panel to create a query with filter on COLUMN_NAME
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The interview was with Verizon client directly.They took only one round and I was selected.