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PayU Software Development Engineer 2 Interview Experience

Software Development Engineer 2

PayU
June 10, 2025
8 Questions
Selected

Summary

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The PayU interview process for the Software Engineer (Frontend) position consisted of a technical round where candidates faced a series of challenging questions. The interview covered various topics, including API synchronization, React app optimization, web security issues like CORS, and JWT management. Overall, the interview at PayU was technically demanding and designed to assess in-depth knowledge of frontend development and web technologies.

1

Technical Round 3

#1

Synchronizing Frontend with Wait for Bank API

How would you sync a frontend application that initiates a transaction with a bank, considering that the initial API call doesn't confirm success or failure? Discuss your approach without needing to provide code.
api
polling
frontend
Medium
#2

Building and Optimizing a React App

What are the steps you take to build a React app, and what optimizations can you implement to enhance loading speed?
react
optimization
frontend
Medium
#3

Clearing Cache After Production Push

How do you ensure that every user has access to the updated website content after a new production deployment by clearing the cache?
caching
deployment
frontend
Medium
#4

Understanding CORS Errors

What is a CORS error, and how can you fix it? Please explain the concept of IP whitelisting in this context.
cors
web-security
frontend
Medium
#5

Managing JWT Tokens

How do you store JSON Web Tokens (JWTs), clean them, and implement protected routes in a web application?
jwt
authentication
frontend
Medium
#6

Cookies, Sessions, and Local Storage Differences

What are the differences between cookies, sessions, and local storage? Under what circumstances should each be used?
web-storage
cookies
sessions
Medium
#7

Token and Payload Encryption

How do you generally protect tokens or payloads from being intercepted by APIs?
security
encryption
apis
Medium
#8

Authentication vs Authorization

What is the difference between authentication and authorization?
security
authentication
authorization
Easy
frontendinterviewsoftwareengineerpayuinterviewexperiencepayu
r

ritwik chakraborty

Verified User

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