Razorpay Interview Questions and Answers

Q1. PUB-SUB MODEL MACHINE CODING
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Q2. RATE LIMITOR MACHINE CODING
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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?
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Q2. Why do you think you are good fit for the role?
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Q3. What are the key challenges that you faced in your last job?
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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
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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
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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
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Q2. String problem medium problem
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Q1. I am not selected
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