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Frontend Software Engineer Interview Questions

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13,290 frontend software engineer interview questions shared by candidates

We have a web application where users can upload multiple files simultaneously. Sometimes users accidentally click the upload button multiple times, causing duplicate API calls. How would you prevent this without disabling the button completely, and what are the potential issues you might face with your solution? Then they asked me to actually code a solution and explain my thought process. They were more interested in how I approached the problem - considering user experience, edge cases, and potential race conditions - rather than just writing code. Made me think about real scenarios developers actually face instead of just algorithmic puzzles.

Junior Frontend Developer

Interviewed at Superleap

4.3★
Sep 2, 2025

We have a web application where users can upload multiple files simultaneously. Sometimes users accidentally click the upload button multiple times, causing duplicate API calls. How would you prevent this without disabling the button completely, and what are the potential issues you might face with your solution? Then they asked me to actually code a solution and explain my thought process. They were more interested in how I approached the problem - considering user experience, edge cases, and potential race conditions - rather than just writing code. Made me think about real scenarios developers actually face instead of just algorithmic puzzles.

in the name of technical questions. interviewer asked me 2 reasoning/logical question . 1. 3 vessels of 8 ,5 and 3 litres 8 litres is full of water How will you distribute 8 litres in 4 and 4 litres in 5 and 8 litres vessels? 2. pay an employee using the silver rod of 7kg..
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Frontend Developer

Interviewed at OneBanc Technologies Pvt. Ltd

4.9★
Jun 3, 2022

in the name of technical questions. interviewer asked me 2 reasoning/logical question . 1. 3 vessels of 8 ,5 and 3 litres 8 litres is full of water How will you distribute 8 litres in 4 and 4 litres in 5 and 8 litres vessels? 2. pay an employee using the silver rod of 7kg..

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