Epsilon Software Engineer Level 1 Interview Questions, Process, and Tips

First round was online assessment where Aptitude Questions, Technical MCQs and 2 coding questions were asked. Coding questions level easy

Q1. Write a program to check if a given string can become palindrome if letters are re-arranged
Ans. 
Program to check if a string can be rearranged to form a palindrome
• Create a frequency map of characters in the string

• Count the number of characters with odd frequencies

• If there is at most one character with odd frequency, the string can be rearranged to form a palindrome
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Q2. Different Data types in Python ?
Ans. 
Python supports various data types including integers, floats, strings, lists, tuples, dictionaries, and more.
• Integers: whole numbers without decimal points (e.g. 5, -3)

• Floats: numbers with decimal points (e.g. 3.14, -0.5)

• Strings: sequences of characters enclosed in quotes (e.g. 'hello', '123')

• Lists: ordered collections of items (e.g. [1, 'apple', True])

• Tuples: ordered, immutable collections of items (e.g. (1, 'banana'...read more
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Q3. Some basic probability based questions
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Q1. Explain your project.
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Q2. What is Normalization ?
Ans. 
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization is used to eliminate data redundancy by dividing the database into multiple tables and defining relationships between them.

• It helps in reducing data anomalies such as insertion, update, and deletion anomalies.

• Normalization is achieved through a series of stages called normal forms (1NF, 2NF, 3NF, ...read more
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Q3. What is diamond problem in Java?
Ans. 
Diamond problem in Java occurs when a class inherits from two classes that have a common ancestor, resulting in ambiguity.
• Occurs in multiple inheritance when a class inherits from two classes that have a common ancestor

• Results in ambiguity as the compiler cannot determine which method to call

• Can be resolved using interfaces or by explicitly overriding methods
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Q4. What is the differences between Java and Python?
Ans. 
Java is statically typed, object-oriented language with a focus on performance and scalability. Python is dynamically typed, high-level language known for its simplicity and readability.
• Java is statically typed, meaning variable types are explicitly declared at compile time. Python is dynamically typed, allowing for more flexibility but potentially leading to runtime errors.

• Java is more verbose and requires more boiler...read more
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Q5. Latest version of Java
Ans. 
Java 17 is the latest version as of September 2021.
• Java 17 was released on September 14, 2021.

• It includes new features like sealed classes, pattern matching for switch statements, and more.

• Oracle provides long-term support for Java 17 until 2029.
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Q6. Write SQL query to find 2nd largest Number from DB?
Ans. 
Use a subquery to find the 2nd largest number in a database table.
• Use a subquery to select all distinct numbers from the table

• Order the numbers in descending order

• Use LIMIT 1,1 to select the second row which will be the 2nd largest number
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Q1. Who is your Inspiration
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Q2. Why do you want to join Epsilon
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