CRED Backend Developer Interview Questions and Answers

There was a coding question of string level was Easy to Medium and we can also expect SQL query in this

Q1. Design Book My Show
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Q2. Project Discussion
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Q1. I Expected the HLD in this but for freshers there is no HLD only DSA, that was N- Queen Problem
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Q2. Project Discussion that's it
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Q1. Basic HR Questions
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Q2. It's easy round
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There are 3 questions. basic to medium level.

Q1. Introduction about yourself
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Q2. Explain about your projects
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Q3. Solve a Coding problem
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Q4. Walk through project code
Ans. 
I will walk through a project code to explain its structure and functionality.
• Start by explaining the overall architecture of the project

• Discuss the main components/modules and their interactions

• Explain any key algorithms or data structures used

• Highlight any design patterns or best practices implemented

• Provide examples of specific code snippets to illustrate your points
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Q1. Does Java support pass by reference?
Ans. 
Yes
• Java uses pass by value for all variables, including object references.

• When an object reference is passed as an argument, a copy of the reference is passed, not the actual object.

• Modifying the reference inside the method will not affect the original reference outside the method.

• However, modifications to the object's state inside the method will be visible outside the method.
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Q2. Explain Singleton Pattern
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Singleton pattern restricts the instantiation of a class to a single object.
• Singleton pattern ensures that only one instance of a class exists throughout the application.

• It provides a global point of access to the instance.

• Commonly used in scenarios where a single instance needs to coordinate actions across the system.

• Example: Database connection manager, logger, configuration manager.
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Q1. Internal Implementation of HashMap
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HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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Q1. Data Structure and algorithm
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Q2. System design question
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2hrs aptitude test was there

2 hrs coding test was there

GD was conducted and then i passed it

Round one consist of coding problems and there's a minimum criteria of solving 2 problems at least to clear this round

Q1. First question was a coding question, merge intervals leetcode
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Q2. Second question was again of leetcode, compare strings
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Test was based on arrays and some dsa concepts.