Calsoft Software Developer Interview Questions and Answers

Hackearth online coding test for 1 hour

Q1. Dsa question and output questions
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Q2. Find k largest element in an array
Ans. 
Use sorting or heap data structure to find k largest elements in an array of strings.
• Sort the array in descending order and return the first k elements.

• Use a max heap data structure to efficiently find the k largest elements.

• Examples: ['apple', 'banana', 'orange', 'kiwi'], k=2 -> ['orange', 'kiwi']
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Q1. Remove duplicates from array
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Remove duplicates from array of strings
• Create a Set to store unique strings

• Iterate through the array and add each string to the Set

• Convert the Set back to an array to get the unique strings
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Q2. Output related questions on student class object
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Coding round is related to DSA

Q1. Java related questions
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Q2. Explain about your project
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Q1. Salary negotiation
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Q2. Why you want to join us?
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Technology advantage or not

All aptitude topics,logical reasoning

Q1. Oops,2 coding questions
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Q2. Palindrome,even number
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Q1. What do you know
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Q2. Do you have any questions
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Q1. REST API for User CRUD
Ans. 
Design a RESTful API for CRUD operations on user resources.
• Use HTTP methods like GET, POST, PUT, DELETE for CRUD operations

• Create endpoints like /users for listing all users, /users/{id} for specific user

• Use status codes like 200 for success, 404 for not found, 400 for bad request

• Implement authentication and authorization mechanisms for security

• Include request and response body formats like JSON or XML
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Q2. Two Sum Leetcode problem
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Q3. Basic questions based on the candidate technical skills
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Q1. Basics to Intermediate level of questions based on the skills mentioned in the resume
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Q2. Projects related discussions
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Q1. I was informed to upload the supporting documents. ( They rejected me after this eventhough all my documents are genuine )
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Q1. What is OOPS ?
Ans. 
OOPS stands for Object-Oriented Programming System. It is a programming paradigm based on the concept of objects.
• OOPS focuses on creating objects that contain data and methods to manipulate that data.

• It allows for encapsulation, inheritance, and polymorphism.

• Examples of OOPS languages include Java, C++, and Python.
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Q2. What is Dependency Injection
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Dependency Injection is a design pattern where components are given their dependencies rather than creating them internally.
• Allows for easier testing by mocking dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Example: Constructor injection, Setter injection
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Q1. Which Architechture does you project build by?
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Q2. What is Normalization in sql?
Ans. 
Normalization in SQL is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization involves breaking down a table into smaller tables and defining relationships between them.

• It helps in reducing data redundancy by storing data in a structured manner.

• There are different normal forms like 1NF, 2NF, 3NF, and BCNF that define the level of normalization.

• Example: If we have a t...read more
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Q1. Tell about your self ?
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Q2. Whom do you provide your first month salary ?
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Normal coding round with simple oa complexity

Q1. Discussion on projects
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Q2. Culture fit check
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Q1. How does consumer, producer work in kafka
Ans. 
Consumers read data from topics, while producers write data to topics in Kafka.
• Consumers subscribe to topics to read messages from them

• Producers publish messages to topics for consumers to read

• Consumers can be part of a consumer group to scale out consumption

• Producers can specify key for messages to control partitioning
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