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Senior Frontend Engineer Interview Questions

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1,542 senior frontend engineer interview questions shared by candidates

Interview was for React/Node profile, almost no questions related to these technologies were asked instead all questions were focussed on Bootstrap and CSS (!!!) Interviewer was literally obsessed over bootstrap. Only react related question was what is a virtual DOM - which is very philosophical question IMO (interviewer asks this question when they as asking from online react questions)
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Senior Frontend Engineer

Interviewed at State Street

3.4★
Oct 8, 2020

Interview was for React/Node profile, almost no questions related to these technologies were asked instead all questions were focussed on Bootstrap and CSS (!!!) Interviewer was literally obsessed over bootstrap. Only react related question was what is a virtual DOM - which is very philosophical question IMO (interviewer asks this question when they as asking from online react questions)

- Questions about Java classes and backend code, which felt unrelated to a frontend position. - Algorithms and data structure exercises that are rarely used in real-world mobile development. - The focus was more on theoretical knowledge than practical skills relevant to the role. - The interviewer had not reviewed the submitted code beforehand and seemed unfamiliar with basic data structures like a Map — a structure that stores key-value pairs.
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Senior Frontend Engineer

Interviewed at Cobee

3.7★
Apr 22, 2025

- Questions about Java classes and backend code, which felt unrelated to a frontend position. - Algorithms and data structure exercises that are rarely used in real-world mobile development. - The focus was more on theoretical knowledge than practical skills relevant to the role. - The interviewer had not reviewed the submitted code beforehand and seemed unfamiliar with basic data structures like a Map — a structure that stores key-value pairs.

Considering you have file that contains various file paths as comma delimited strings as input. Example - ``` a,b,c,d,e,g a,d,f,e,r b,t,y,a,r ``` Each line represents a path. Assume that there is folder b and d inside a and then folders are further nested inside both b and d too. The task is to prepare a UI where we should have a dropdown listing down the first level of folders and as you make a selection, more dropdowns should appear to choose the folders from available options at each nested level. This should happen really efficiently with zero lag. These strings can have millions of values with billions of such strings.
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Senior Frontend Engineer

Interviewed at SigNoz

2.7★
Apr 16, 2025

Considering you have file that contains various file paths as comma delimited strings as input. Example - ``` a,b,c,d,e,g a,d,f,e,r b,t,y,a,r ``` Each line represents a path. Assume that there is folder b and d inside a and then folders are further nested inside both b and d too. The task is to prepare a UI where we should have a dropdown listing down the first level of folders and as you make a selection, more dropdowns should appear to choose the folders from available options at each nested level. This should happen really efficiently with zero lag. These strings can have millions of values with billions of such strings.

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