Skip to contentSkip to footer

Senior Frontend Engineer Interview Questions

Salaries
Interviews

1,539 senior frontend engineer interview questions shared by candidates

The tests is basic: Show some posts on an infinite list. The first thing they do is to suggest to use an api "dummyjson" BUT the thing is, if you use it, you cannot accomplish most of the requirements of the task. Sadly I used it and I received this feedback: 1. wrong data fetching approach - multiple user API requests: (I had to use the post to get the user data, so yes, obviously you need to make another user request - because of the API that he suggested - very smart guy) 2. lack of understanding of the principles of functional programming (Again, I had to make usage of caché to get users for the posts because of the API that he recommended for the task, Also he said i didnt used thunks (think I did) and that a I had side effects which is partially true, because the API requires to get user data). So I asked chatgpt and taking into account the resources I had the solution was okay as I did "In practical terms, if you need the user data for the transformation, separating them isn't always possible without adding unnecessary complexity." 3. missing websocket implementation (You cant do it if you use that API - emulating the behaviour is not "correct" for them) Aside from the developer's poor technical skills (lack of understanding browser caching, lack of understanding of how REST works, inability to differentiate an async thunk), and the poor soft skills he used to provide feedback, he didn't care at all that the solution was performant and solved the task at hand, even within the API's limitations.
avatar

Senior Software Engineer (FrontEnd)

Interviewed at ESL FACEIT GROUP

2.8★
Mar 16, 2025

The tests is basic: Show some posts on an infinite list. The first thing they do is to suggest to use an api "dummyjson" BUT the thing is, if you use it, you cannot accomplish most of the requirements of the task. Sadly I used it and I received this feedback: 1. wrong data fetching approach - multiple user API requests: (I had to use the post to get the user data, so yes, obviously you need to make another user request - because of the API that he suggested - very smart guy) 2. lack of understanding of the principles of functional programming (Again, I had to make usage of caché to get users for the posts because of the API that he recommended for the task, Also he said i didnt used thunks (think I did) and that a I had side effects which is partially true, because the API requires to get user data). So I asked chatgpt and taking into account the resources I had the solution was okay as I did "In practical terms, if you need the user data for the transformation, separating them isn't always possible without adding unnecessary complexity." 3. missing websocket implementation (You cant do it if you use that API - emulating the behaviour is not "correct" for them) Aside from the developer's poor technical skills (lack of understanding browser caching, lack of understanding of how REST works, inability to differentiate an async thunk), and the poor soft skills he used to provide feedback, he didn't care at all that the solution was performant and solved the task at hand, even within the API's limitations.

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)
avatar

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)

Viewing 521 - 530 interview questions

Glassdoor has 1,539 interview questions and reports from Senior frontend engineer interviews. Prepare for your interview. Get hired. Love your job.