Cashfree Payments Software Development Engineer 3 Interview Questions and Answers

Q1. Smallest difference pair of values between two unsorted arrays
Ans. 
Find the smallest difference pair of values between two unsorted arrays.
• Sort both arrays and compare elements to find the smallest difference.

• Use two pointers approach to iterate through both arrays simultaneously.

• Consider edge cases like empty arrays or arrays with only one element.
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Q2. 2D matrix iteration based question
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Q3. What is normalisation in DBMS?
Ans. 
Normalization in DBMS 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 and organized manner.

• There are different normal forms such as 1NF, 2NF, 3NF, BCNF, and 4NF, each with specific rules to follow.

• For...read more
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Q4. What is the difference between SQL and NoSQL?
Ans. 
SQL is a traditional relational database management system, while NoSQL is a non-relational database system.
• SQL is table-based, with a predefined schema, while NoSQL is document, key-value, wide-column, or graph-based, with dynamic schema.

• SQL is suitable for complex queries and transactions, while NoSQL is better for hierarchical data storage and real-time applications.

• SQL is ACID-compliant (Atomicity, Consistency, Iso...read more
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Q1. Design Dream 11 application in high level.
Ans. 
Dream 11 is a fantasy sports platform where users can create their own teams and compete in various sports leagues.
• User registration and login functionality

• Ability to create and join contests

• Player selection and team creation feature

• Real-time scoring and leaderboard updates

• Integration with payment gateway for transactions
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Q1. Explain your recent project in your current company.
Ans. 
Developed a web application for tracking employee attendance and generating reports.
• Used React for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database storage

• Integrated authentication and authorization features for secure access
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Q1. Why do you want to join Yubi and leave Tavant?
Ans. 
I am excited about the innovative projects at Yubi and believe it aligns better with my career goals.
• Yubi offers more opportunities for growth and learning in cutting-edge technologies.

• I am drawn to Yubi's company culture and values, which resonate with my own.

• I see Yubi as a better fit for my long-term career aspirations compared to Tavant.
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Q2. What process do you follow to switch to a new technology?
Ans. 
I follow a structured approach to evaluate the new technology, learn it through online resources or courses, practice with small projects, and gradually incorporate it into larger projects.
• Research the new technology to understand its features, benefits, and use cases

• Take online courses or tutorials to learn the basics of the technology

• Practice by working on small projects or side projects to gain hands-on experience

• Gr...read more
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Q1. Describe projects
Ans. 
I have worked on various projects including developing web applications, creating mobile apps, and implementing machine learning algorithms.
• Developed a web application for a retail company to manage inventory and sales data

• Created a mobile app for a fitness tracking platform to track user's exercise routines

• Implemented machine learning algorithms for a recommendation system in an e-commerce website
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Q2. Knowledge testing on ML frameworks
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Had a overall personality, technical & problem solving test with AVP