Senior Frontend Engineer Interview Questions

13,313 senior frontend engineer interview questions shared by candidates

A junior developer changes the color of a button on a page. All unit and end-to-end tests pass, and you deploy the code to production. However, something goes wrong in production. How could you have caught this issue before going live?
avatar

Senior Frontend Developer

Interviewed at Insider One

4.3
Jun 28, 2025

A junior developer changes the color of a button on a page. All unit and end-to-end tests pass, and you deploy the code to production. However, something goes wrong in production. How could you have caught this issue before going live?

Q.If a button hit results in an API hit, and if I hit the button multiple times, how can you do it the angular way to make sure all n-1 requests sent to Server are cancelled and only nth request is send to server? How will you accomplish this? Q. A Puzzle: child1 says "I am a boy". child2 says "I am a girl". Given that atleast 1 is lying, how will you determine who is boy, who is girl? Q.Why is Angular used over JavaScript? Q.Two sorted arrays(no.s) of n, m+n length where m+n one has n empty places. In minimum Time Complexity & Space, obtain the combination sorted into m+n array.
avatar

Software Engineer(Frontend)

Interviewed at Quovantis Technologies

4
Jan 27, 2017

Q.If a button hit results in an API hit, and if I hit the button multiple times, how can you do it the angular way to make sure all n-1 requests sent to Server are cancelled and only nth request is send to server? How will you accomplish this? Q. A Puzzle: child1 says "I am a boy". child2 says "I am a girl". Given that atleast 1 is lying, how will you determine who is boy, who is girl? Q.Why is Angular used over JavaScript? Q.Two sorted arrays(no.s) of n, m+n length where m+n one has n empty places. In minimum Time Complexity & Space, obtain the combination sorted into m+n array.

Online Coding Question: Given an Array of numbers only, use the array sort API to sort it such that : a. The even numbers come to the left of array. b. The odd numbers come to the right of array. c. The groups of even & odd numbers is sorted in increasing order in itself. E.g.: Input : [99,88,77,66,55,44,33,22,11,94,87,2,9,13] Output: [2,22,44,66,88,94,9,11,13,33,55,77,87,99]

Frontend Engineer

Interviewed at Pepo

5
May 5, 2016

Online Coding Question: Given an Array of numbers only, use the array sort API to sort it such that : a. The even numbers come to the left of array. b. The odd numbers come to the right of array. c. The groups of even & odd numbers is sorted in increasing order in itself. E.g.: Input : [99,88,77,66,55,44,33,22,11,94,87,2,9,13] Output: [2,22,44,66,88,94,9,11,13,33,55,77,87,99]

Viewing 771 - 780 interview questions

Glassdoor has 13,313 interview questions and reports from Senior frontend engineer interviews. Prepare for your interview. Get hired. Love your job.