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Senior Frontend Engineer Interview Questions

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1,551 senior frontend engineer interview questions shared by candidates

1. What’s the difference between using position: absolute and position: relative on a element in CSS? 2. How would you go about extending a form control or a component in Angular? 3. If you have a web app open in multiple browser tabs, how can you keep the state synchronized between them—so that an update in one tab reflects in all the others? 4. Can you describe the most challenging technical issue you’ve faced and how you went about solving it? 5. What are some best practices you follow when writing unit tests? 6. Code challenge: Given an array like [-1, -1, 2, 3, -1], how would you extract the unique negative values and return their sum?
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Senior Frontend Engineer - Angular (all genders)

Interviewed at Lucanet

3.6★
Jun 21, 2025

1. What’s the difference between using position: absolute and position: relative on a element in CSS? 2. How would you go about extending a form control or a component in Angular? 3. If you have a web app open in multiple browser tabs, how can you keep the state synchronized between them—so that an update in one tab reflects in all the others? 4. Can you describe the most challenging technical issue you’ve faced and how you went about solving it? 5. What are some best practices you follow when writing unit tests? 6. Code challenge: Given an array like [-1, -1, 2, 3, -1], how would you extract the unique negative values and return their sum?

Generic technical questions with the EM which were fair. The problem is more the technical task – the two people running the interview had zero empathy and no way of making the session a comfortable experience. Asked specific questions about cases with promises and such while in total silence, which led to pressure and very slow response on my side. Gotta admit I was missing some of the bits, and that's on me, but I highly disagree with such an approach – letting people use google is not gonna make people more comfortable – and testing devs on one specific argument is never gonna tell you anything about their seniority.
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Senior Frontend Engineer

Interviewed at Photobox

3.6★
Sep 2, 2022

Generic technical questions with the EM which were fair. The problem is more the technical task – the two people running the interview had zero empathy and no way of making the session a comfortable experience. Asked specific questions about cases with promises and such while in total silence, which led to pressure and very slow response on my side. Gotta admit I was missing some of the bits, and that's on me, but I highly disagree with such an approach – letting people use google is not gonna make people more comfortable – and testing devs on one specific argument is never gonna tell you anything about their seniority.

1. Given a set of wireless routers that are interconnected, write an algorithm that finds the longest distance between these routers 2. Was supposed to be a system design interview, but this was the interviewer who arrived late and had no idea what he was supposed to interview for. 3. Design algorithm to instruct a robot how to go through a maze 4. Implement an auto-complete // trie implementation 5. Behavioral questions
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Senior Software Engineer (FrontEnd)

Interviewed at Google

4.4★
May 7, 2022

1. Given a set of wireless routers that are interconnected, write an algorithm that finds the longest distance between these routers 2. Was supposed to be a system design interview, but this was the interviewer who arrived late and had no idea what he was supposed to interview for. 3. Design algorithm to instruct a robot how to go through a maze 4. Implement an auto-complete // trie implementation 5. Behavioral questions

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