Zepto Senior Software Engineer Interview Questions and Answers

Q1. Low Level Design for Chess
Ans. 
Low level design for a chess game including classes, functions, and data structures.
• Create classes for pieces (e.g. Pawn, Rook, Bishop) with properties like position and color

• Implement functions for moving pieces, checking valid moves, and capturing opponent pieces

• Use data structures like 2D arrays to represent the chess board and track piece positions
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It was a bar raiser round and questions were related to trees and binary search

Two medium DSA questions based on strings.

Q1. Design Google Meet
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Q1. Replace all zeros to 1 which are surrounded by 1's
Ans. 
Replace zeros surrounded by ones with ones in an array of strings
• Iterate through each string in the array

• Check for zeros surrounded by ones and replace them with ones

• Return the modified array of strings
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Q2. Minimum jumps to reach end of an array
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Q1. LLD Round:- Design classes for bidding system when new bid notifications shown to all users who already bided for it.
Ans. 
Design classes for a bidding system with new bid notifications for users who have already bid.
• Create a Bid class with attributes like bidder, amount, timestamp, etc.

• Create a Notification class with attributes like message, recipient, timestamp, etc.

• Create a BiddingSystem class to manage bids and notifications.

• Implement a method in BiddingSystem to notify users who have already bid when a new bid is placed.

• Consider usin...read more
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Q2. HLD:- Desing Post order service, or last mile like finding rider, notifications etc
Ans. 
Design a last-mile delivery service focusing on rider allocation and notifications.
• User requests a delivery via mobile app, specifying pickup and drop-off locations.

• System matches the request with available riders using geolocation and proximity algorithms.

• Notifications are sent to users and riders via push notifications or SMS for updates.

• Riders can accept or decline requests, with the system reassigning if declined.

• R...read more
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DSA, 1 hour with 2 LC medium questions

Q1. Low level design
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Q2. Design lld for Dream 11
Ans. 
Designing the low-level design for Dream 11 platform.
• Use microservices architecture for scalability and flexibility.

• Implement a robust database schema to handle large amounts of user data.

• Utilize caching mechanisms to improve performance, especially during peak usage times.

• Include authentication and authorization mechanisms to ensure data security.

• Design APIs for seamless integration with third-party services.

• Implement...read more
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Q1. High level design
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Q2. Design HLD for rider management system
Ans. 
Design HLD for rider management system
• Use microservices architecture for scalability and flexibility

• Implement user authentication and authorization for security

• Include features like ride tracking, payment processing, and feedback system

• Utilize databases for storing rider information and ride history
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