Razorpay Interview Questions and Answers

Q1. PUB-SUB MODEL MACHINE CODING
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Q2. RATE LIMITOR MACHINE CODING
Ans. 
A rate limiter controls the number of requests a user can make to a service in a given timeframe.
• Use a token bucket algorithm to allow bursts of requests while enforcing a limit over time.

• Implement a sliding window counter to track requests in a specific time frame.

• Consider using Redis for distributed rate limiting across multiple servers.

• Example: Limit to 100 requests per minute per user.

• Use HTTP headers to inform use...read more
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Q1. LLD/Machine coding - Design a social media application with users, posts, comments, likes, etc. There is also an admin who needs to approve post creation and can delete any post they want. Create appropria...read more
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Design a social media app with users, posts, comments, likes, and admin functionalities.
• Class User: Represents a user with attributes like userId, username, and methods to create posts and comments.

• Class Post: Represents a post with attributes like postId, content, userId, and methods for liking and commenting.

• Class Comment: Represents a comment with attributes like commentId, content, userId, and methods to like comme...read more
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Q1. High-level design - Design a chat-based application like WhatsApp with only user-to-user chat feature (no group chats). Explain and draw out the E2E design by mentioning all the components and design decis...read more
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Design a user-to-user chat application similar to WhatsApp focusing on scalability, security, and real-time messaging.
• Use a client-server architecture with mobile and web clients communicating with a central server.

• Implement WebSocket for real-time communication to ensure instant message delivery.

• Utilize a NoSQL database like MongoDB for storing user profiles and chat history.

• Incorporate user authentication using JWT (...read more
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Q1. Hiring Manager - basic questions like why Razorpay, what are your career goals, what does career growth look like for you, etc.
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Q1. Why do you want to join this company?
Ans. 
I am drawn to this company for its innovative approach, strong values, and commitment to making a positive impact in the industry.
• Innovative Culture: The company is known for its cutting-edge solutions, like the recent launch of a groundbreaking product that transformed user experience.

• Alignment with Values: I resonate with the company's mission to prioritize sustainability, as seen in its initiatives to reduce carbon ...read more
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Q2. Why do you think you are good fit for the role?
Ans. 
I possess a unique blend of strategic thinking, leadership skills, and operational expertise that aligns perfectly with the Chief of Staff role.
• Strategic Vision: I have successfully led cross-functional teams to develop and implement strategic initiatives, such as a company-wide efficiency program that increased productivity by 20%.

• Strong Communication: My experience in stakeholder management has honed my ability to co...read more
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Q3. What are the key challenges that you faced in your last job?
Ans. 
In my last job, I faced challenges in team alignment, resource allocation, and adapting to rapid changes in project scope.
• Team Alignment: Ensuring all team members were on the same page regarding project goals was challenging, especially during cross-departmental collaborations.

• Resource Allocation: I had to manage limited resources effectively, prioritizing tasks to meet deadlines without compromising quality, such as ...read more
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There were DSA questions and time limit was 1 hr

Q1. Calculate factorial using tabulation
Ans. 
Factorial calculation using tabulation in dynamic programming
• Create an array to store factorial values up to n

• Initialize the array with base cases (0! = 1, 1! = 1)

• Iterate from 2 to n and calculate factorial using previous values in the array

• Return the factorial value at index n
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Q2. Wildcard matching question
Ans. 
Wildcard matching checks if a string matches a pattern with '*' and '?' as wildcards.
• Use '*' to match any sequence of characters. Example: 'a*b' matches 'ab', 'aXb', 'a123b'.

• '?' matches any single character. Example: 'a?c' matches 'abc', 'axc', but not 'ac'.

• Implement using dynamic programming for efficiency, especially for longer strings.

• Consider edge cases like empty strings and patterns.
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There were mcqs in atitude test.

Q1. What is ai and what are its features
Ans. 
AI stands for artificial intelligence, which is the simulation of human intelligence processes by machines.
• AI involves machines performing tasks that typically require human intelligence, such as visual perception, speech recognition, decision-making, and language translation.

• AI systems can learn from data, adapt to new inputs, and perform tasks autonomously.

• Examples of AI include virtual assistants like Siri and Alexa...read more
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Q2. Oops questions including abstraction
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Aptitude and coding both

Q1. Merge interval greedy problem
Ans. 
Merge overlapping intervals to create a new set of non-overlapping intervals.
• Sort the intervals based on the start time.

• Iterate through the intervals and merge overlapping intervals.

• Return the merged intervals as the final result.
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Q2. String problem medium problem
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Q1. I am not selected
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