EarlySalary Services Software Developer Intern Interview Questions and Answers

Basic DSA and android questions

Live coding round for android

Q1. Explain your past experiences?
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Blood relation, coding and decoding, number system , percentage

Q1. LLD HLD HM rounds
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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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Basic DS Question, Medium level difficulty , followed with some puzzles

Q1. System Design : Design in memory Database
Ans. 
Designing an in-memory database involves optimizing data storage and retrieval for fast performance.
• Use data structures like hash tables or B-trees for efficient indexing and searching

• Implement caching mechanisms to reduce disk I/O and improve read/write speeds

• Consider data durability and consistency mechanisms to prevent data loss in case of system failures
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Q1. Discussion with Manager, on projects/work experience and questions around challenges, more on resume /work experience
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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
Ans. 
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
Ans. 
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. There were basic DSA questions
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Q2. Few questions based on Resume and Projects
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