upGrad SDE-2 Interview Questions, Process, and Tips

Round duration - 60 mins
Round difficulty - Easy

This round was mostly consisted of question javascript, html, css, react fundamentals.

Round duration - 90 Minutes
Round difficulty - Medium

Question was to design a calculator and make it using React.

Q1. Design a calculator and create a working prototype using React.
Ans. 
Design and create a calculator prototype using React
• Create a component for the display screen

• Implement functions for basic arithmetic operations

• Use state to store current input and result

• Design buttons for numbers and operators

• Handle user input and update display accordingly
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Round duration - 60 Minutes
Round difficulty - Medium

This was the round with the Director of Engineering.

Round duration - 60 Minutes
Round difficulty - Medium

It was a video call round with discussion on the basic of web programming like HTML CSS JS

Q1. What are the best practices for developing websites?
Ans. 
Best practices for developing websites include responsive design, clean code, SEO optimization, and regular testing.
• Implement responsive design to ensure compatibility across devices

• Write clean and organized code for maintainability and scalability

• Optimize for SEO by using relevant keywords, meta tags, and sitemaps

• Regularly test the website for performance, security, and usability issues
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Round duration - 60 Minutes
Round difficulty - Medium

System design

Q1. Design a real-time text editor that allows multiple users to collaborate and edit documents simultaneously.
Ans. 
Design a real-time text editor for multiple users to collaborate and edit documents simultaneously.
• Implement a server-client architecture where the server stores the document and handles synchronization between clients.

• Use operational transformation algorithms to resolve conflicts when multiple users edit the same document simultaneously.

• Include features like real-time cursor tracking, chat functionality, and version h...read more
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Round duration - 60 Minutes
Round difficulty - Medium

Data structures questions with complexity discussions

Q1. 
Sort 0 and 1 Problem Statement
Given an integer array ARR of size N containing only integers 0 and 1, implement a function to sort this array. The solution should scan the array only once without using an...read more
Ans. 
Sort an array of 0s and 1s in linear time without using additional arrays.
• Use two pointers approach to swap 0s to the left and 1s to the right.

• Keep track of the leftmost index of 1s to place 0s before it.

• Iterate through the array once and swap elements accordingly.
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Q2. What are the best practices to secure your application from a frontend perspective?
Ans. 
Best practices for securing applications from a frontend perspective
• Implement input validation to prevent injection attacks

• Use HTTPS to encrypt data transmission between client and server

• Avoid storing sensitive information in client-side storage like cookies or local storage

• Implement Content Security Policy (CSP) to prevent cross-site scripting attacks

• Regularly update dependencies and libraries to patch security vulner
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