CoinTribe Software Engineer Interview Questions and Answers

There was a hacker rank assignment

Leetcode style question, medium

Q1. They asked Java coding question
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Q1. System design question normal
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Coding question of moderate difficulty

In round 1 we could only use Java

Q1. Interviewers are very friendly. Mostly the questions were based on SQL, dsa
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Technical MCQs (OS, CN, etc.), 2 coding questions (medium level)

Q1. Leetcode - Rainwater Harvesting
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Q2. Leetcode - Array/String
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Q1. HR + Resume Review (Technical)
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Q2. Explain Projects/Experience
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Q1. Find connected components in a graph
Ans. 
Use Depth First Search (DFS) to find connected components in a graph
• Start by initializing all vertices as unvisited

• Iterate through each vertex and perform DFS to find connected components

• Keep track of visited vertices to avoid revisiting

• Example: For a graph with vertices {A, B, C} and edges {(A, B), (B, C)}, the connected components are {A, B, C}
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Q1. Design chess game
Ans. 
Design a chess game with proper board setup, piece movements, and win conditions.
• Create a 8x8 grid to represent the chess board

• Assign initial positions to each type of chess piece (pawn, rook, knight, bishop, queen, king)

• Implement rules for each piece's movement (e.g. pawn moves forward, rook moves horizontally/vertically)

• Check for valid moves and capture opponent's pieces

• Implement win conditions (checkmate, stalemate)

• ...read more
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Q1. Tech concepts and algo
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Q1. Startup mindset
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Q1. Speed and quality
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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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