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
Ans. 
Design a platform for booking movie tickets, managing shows, and providing user-friendly features for moviegoers.
• User Registration: Users can create accounts to manage bookings and preferences.

• Movie Listings: Display current and upcoming movies with details like genre, duration, and ratings.

• Showtimes: Provide a schedule of showtimes for each movie in various theaters.

• Seat Selection: Allow users to select their preferre...read more
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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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I'm a passionate Backend Developer with experience in building scalable applications and optimizing server-side logic.
• 5+ years of experience in backend development using Node.js and Express.

• Proficient in database management with PostgreSQL and MongoDB.

• Experience in designing RESTful APIs for seamless integration with frontend applications.

• Worked on cloud platforms like AWS and Azure for deploying applications.

• Strong un...read more
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Q2. Explain about your projects
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I developed a scalable e-commerce platform using microservices architecture, enhancing user experience and performance.
• Utilized Node.js and Express for building RESTful APIs, ensuring efficient data handling.

• Implemented a microservices architecture, allowing independent deployment and scaling of services.

• Integrated MongoDB for a flexible database solution, optimizing data retrieval and storage.

• Employed Docker for conta...read more
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Q3. Solve a Coding problem
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Q4. Walk through project code
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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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Test was based on arrays and some dsa concepts.

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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DS, Algo, DP, Greedy, Stack, Heap

Q1. System Design a DropBox
Ans. 
Design a scalable cloud storage system similar to DropBox.
• Use distributed file system for storing files across multiple servers.

• Implement data deduplication to save storage space.

• Use client-side encryption for security.

• Implement file synchronization across devices.

• Utilize load balancing to distribute user requests.

• Implement version control for files.

• Use metadata for efficient file organization.
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Q2. Design a Linked List
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A linked list is a linear data structure where each element is a separate object with a reference to the next element.
• Start with a Node class that has data and a reference to the next node

• Create a LinkedList class that manages the nodes and provides methods like insert, delete, and search

• Example: Node class - data, next; LinkedList class - head, insert(data), delete(data), search(data)
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Q1. About yourself. Projects worked upon
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Q2. Why want to join Ocrolus?
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I want to join Ocrolus to leverage my skills in automation and data processing to drive innovation in financial technology.
• Ocrolus is at the forefront of automating document processing, which aligns with my passion for leveraging technology to improve efficiency.

• I admire Ocrolus's commitment to accuracy and reliability in data extraction, as seen in their partnerships with leading financial institutions.

• The opportunity...read more
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Q1. Abstract and interface difference
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Abstract classes are classes that cannot be instantiated and can have both abstract and non-abstract methods. Interfaces are a collection of abstract methods.
• Abstract classes can have constructors, interfaces cannot

• A class can implement multiple interfaces, but can only inherit from one abstract class

• Interfaces can be used to achieve multiple inheritance in Java

• Abstract classes can have instance variables, interfaces c...read more
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Q2. Current project
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I am currently working on a project to develop a web-based inventory management system.
• Developing a user-friendly interface for managing inventory

• Implementing database functionality to store and retrieve inventory data

• Integrating with other systems to automate inventory updates

• Creating reports and analytics to track inventory levels and trends
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Sort array without using any inbuilt method?

Min and max value from an array of integers, reverse of a string

Q1. Data Structures, Algorithms, Understand Common Problem Patterns,
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Q2. Advance Laravel and PHP
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