Junior Frontend Developer Interview Questions

286 junior frontend developer interview questions shared by candidates

Basics JS questions including-: Return value of array.push() How sparse array behave? Async Await conversion of promises and error handling Context (this) How Arrow function capture their this lexically instead of following traditional rules? Bind usage
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Jr. Frontend Developer

Interviewed at Commutatus

4.3
Apr 23, 2023

Basics JS questions including-: Return value of array.push() How sparse array behave? Async Await conversion of promises and error handling Context (this) How Arrow function capture their this lexically instead of following traditional rules? Bind usage

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.

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