EPAM Systems Interview Questions, Process, and Tips

Q1. Sorting Algorithms
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Q2. HashMap principles
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HashMap principles involve key-value pairs, hashing, and efficient retrieval.
• HashMap stores key-value pairs using hashing for efficient retrieval.

• Keys must be unique but values can be duplicated.

• HashMap allows null keys and values.

• HashMap is not synchronized, use ConcurrentHashMap for thread safety.
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Q3. Data Structures
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Q4. Spring Fundamentals
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It was F2F interview , where the interviewer was very friendly and he was given a Excel sheet which need to answer few Excel related questions and another SQL querying intermediate to advance level .

Q1. Internals of c# asp net and expect twisted questions
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Q2. Coding questions related to stacks
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Q3. Sql optimisation
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Q4. Entity framework
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Q1. Explain project framework, Testng based questions
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Q2. Programming questions : 2nd duplicate element in array, Find missing element in sequential array, reverse of statement
Ans. 
Find the 2nd duplicate element in an array, identify missing element in sequential array, and reverse a statement.
• To find the 2nd duplicate element in an array, iterate through the array and keep track of elements using a hashmap.

• To identify the missing element in a sequential array, calculate the sum of all elements and find the difference with the expected sum.

• To reverse a statement, split the statement into words, r...read more
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Q1. How to retrive dropped column's in snwofalke
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Q2. What is fail safe feature in snowflake
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Fail-safe feature in Snowflake ensures data integrity and availability by automatically recovering from failures.
• Automatically recovers from hardware failures

• Maintains data integrity during system failures

• Ensures high availability of data

• Supports continuous data processing even during failures
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Q1. Short introduction call. Told about company, job description and position. And gave some general tips about subjects to get prepared for the tech interview...
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Q1. Java Core, Collections, OOP principles, Concurrency
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Q2. Spring Framework, Annotations, Transactional, Strings, Immutable
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Q3. ACID, Isolation Levels, Optimistic Lock
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Q4. Small coding task, preferable using Streams...
Ans. 
Filter out strings starting with 'a' and convert to uppercase using Streams
• Use Stream.filter() to filter out strings starting with 'a'

• Use Stream.map() to convert remaining strings to uppercase

• Collect the result back into an array using Collectors.toList()
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Q5. Small SQL challenge, to implement a query for given examples...
Ans. 
Implement a SQL query for given examples
• Use SELECT statement to retrieve data from tables

• Use WHERE clause to filter results based on conditions

• Use JOIN clause to combine data from multiple tables if needed
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