Persistent Systems Software Engineer Interview Questions, Process, and Tips for Freshers

Moderate I will say.

Q1. Based on DSA (stack), oops and also puzzles
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Q1. Mostly theory based questions on oops and puzzles
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Q1. Normal hr basic questions
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Given a nxm matrix with 0's representing water and 1's representing land. assume everything outside matrix is water. find number of islands. island is something that the land is surrounded by water.

Lexographically sort words in a list

Q1. OOPS and OS concepts
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Q1. OOPs based questions, SQL query questions, ACID properties, Project Discussion
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Q2. Four pillars of OOPs
Ans. 
Encapsulation, Inheritance, Polymorphism, Abstraction
• Encapsulation: Bundling data and methods that operate on the data into a single unit

• Inheritance: Ability to create a new class that inherits attributes and methods from an existing class

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the complex implementation details and showing only the necessary features
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Q3. Behavioral questions
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Q1. Strong any programming language in depth
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Aptitude, reasoning and coding questions were there in round 1

Q1. What data structure has implemented in a elevator.
Ans. 
The data structure implemented in an elevator is a queue.
• Elevator requests are added to the queue in the order they are received.

• The elevator serves requests in a first-come, first-served manner.

• Once a request is completed, it is removed from the queue.

• Example: If someone on the 5th floor requests the elevator, their request is added to the queue and the elevator will serve it after completing any previous requests.
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Q2. Oops concepts , difference between encapsulation and abstract and Polymorphism
Ans. 
Encapsulation is bundling data and methods together, abstraction is hiding implementation details, and polymorphism allows objects to be treated as instances of their parent class.
• Encapsulation involves bundling data and methods within a class to restrict access from outside.

• Abstraction involves hiding the implementation details of a class and only showing the necessary features.

• Polymorphism allows objects to be treate...read more
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Q1. About relocation, communication etc
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