EPAM Systems Interview Questions, Process, and Tips

Q1. Tell me about your experience of BA and in general. Maybe something that is not included in the CV?
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Q2. What are most used BA tools by you?
Ans. 
Some of the most used BA tools by me include Microsoft Excel, Jira, and Lucidchart.
• Microsoft Excel for data analysis and visualization

• Jira for project management and issue tracking

• Lucidchart for creating process flows and diagrams
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Q3. Do you work with SQL or other tools? How you utilize them?
Ans. 
Yes, I work with SQL and other tools to analyze data and generate reports.
• I use SQL to query databases and extract relevant information.

• I also utilize tools like Microsoft Excel and Tableau for data visualization.

• By combining SQL queries with Excel functions, I can create comprehensive reports for stakeholders.
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Aptitude was quite good it has mcq

They have given 3 coding questions

Q1. They asked questions on java
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Q2. Coding questions
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Q1. About your self
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Q2. Projects on resume
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Q1. Sort the array of strings in the lexicographical and length-wise
Ans. 
Sort array of strings lexicographically and by length
• Use built-in sorting functions in programming languages like sort() in Python or Arrays.sort() in Java

• For lexicographical sorting, use default comparison function

• For length-wise sorting, create a custom comparison function based on string length
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Q1. What is equals and hashcode and does Object class implement equals method ?
Ans. 
equals and hashcode are methods in Java used for comparing objects and generating hash codes respectively. Object class does implement equals method.
• equals method is used to compare two objects for equality. It is overridden in most classes to provide custom comparison logic.

• hashcode method is used to generate a unique integer value for an object. It is used in hash-based collections like HashMap.

• Object class does impl...read more
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Q2. What are the time complexities of various data structures.
Ans. 
Time complexities of data structures vary based on operations like insertion, deletion, search, etc.
• Arrays - O(1) for access, O(n) for insertion/deletion

• Linked Lists - O(n) for access, O(1) for insertion/deletion at head/tail

• Stacks - O(1) for push/pop operations

• Queues - O(1) for enqueue/dequeue operations

• Hash Tables - O(1) for average case search/insert/delete

• Binary Trees - O(log n) for search/insert/delete in balanced...read more
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Q3. What is D in SOLID principles.
Ans. 
D stands for Dependency Inversion Principle in SOLID principles.
• High-level modules should not depend on low-level modules. Both should depend on abstractions.

• Abstractions should not depend on details. Details should depend on abstractions.

• Example: Using interfaces to decouple classes and allow for easier testing and maintenance.
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Q4. What are other principles apart from SOLID for best coding practices.
Ans. 
Other principles for best coding practices include DRY, KISS, YAGNI, and design patterns.
• DRY (Don't Repeat Yourself) - Avoid duplicating code by creating reusable functions or classes.

• KISS (Keep It Simple, Stupid) - Write simple and easy-to-understand code rather than overcomplicating it.

• YAGNI (You Aren't Gonna Need It) - Only implement functionality that is needed at the present moment, avoiding unnecessary features.

• D...read more
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Q5. Interviewer asked to write code: 1. How to find if any binary tree is symmetrical. 2. Print even numbers using Java 8 Streams.
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Q1. About the project
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Q2. Evaluation metrics in linear regression, Assumption of linear regression,
Ans. 
Evaluation metrics and assumptions in linear regression
• Evaluation metrics in linear regression include Mean Squared Error (MSE), Root Mean Squared Error (RMSE), R-squared, and Adjusted R-squared.

• Assumptions of linear regression include linearity, independence, homoscedasticity, and normality of residuals.

• Example: MSE = sum((actual - predicted)^2) / n
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Q1. A coding querstion on linkedlist implementation
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Q2. Python basic questions like decorator, singleton class, OOPS
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