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Senior Frontend Engineer Interview Questions

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1,551 senior frontend engineer interview questions shared by candidates

Difference between callbacks and promises. What would happen if you resolve promise twice? General questions about React: what is it, what is reconciliation, Virtual DOM etc. Would Next.js be a good fit for application like GMail?
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Senior Frontend Engineer

Interviewed at FINN

4★
Sep 7, 2022

Difference between callbacks and promises. What would happen if you resolve promise twice? General questions about React: what is it, what is reconciliation, Virtual DOM etc. Would Next.js be a good fit for application like GMail?

You have an in-memory tree data structure. each node can have multiple children (can be more than 2). it's not search or balanced. Task: serialize it to a file so that you can deserialize it later with the same structure node values can be just any integers
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Senior FrontEnd Engineer

Interviewed at Microsoft

4★
May 4, 2016

You have an in-memory tree data structure. each node can have multiple children (can be more than 2). it's not search or balanced. Task: serialize it to a file so that you can deserialize it later with the same structure node values can be just any integers

Round 2 - Architecture - 1 hour - The Frontend team lead took this round. Problem 1 - He started sharing his screen and told me about their platform and the projects they would pick up next. He showed me their UI to write Scala code for a pipeline and asked me to convert that flow to a No/Low code solution. He was continuously using jargon that someone who has already worked with their products knows - such as gems. I had to explicitly ask him to slow down and explain the flow in detail, but he constantly failed to do so. He was talking like I was a member of the team and knew everything about their product. He failed to explain his thoughts clearly and was constantly lacking communication skills. I created wireframes despite lacking context and did my best to give him a solution. He also accepted the solution. Problem 2 - Then he showed me their search component which had an icon that was trailing the text you write in that input. This icon had a jitter and delay as it was moving along with the text. He asked me how I would build and improve this component. I gave him a solution that removed this jitteriness that it had previously. He was skeptical about the solution although my solution was 100% right, I checked that post the interview as well. Problem 3 - Next up, he asked me how I would add a hashtag autocomplete in the same search input. I gave him the solution and he accepted it. He then started talking about a scrolling issue in the same, but he failed to explain what the problem was. We ended the round here. It felt more like a consultancy call instead of an interview where I was solving their product's problems and planning for new features. Result - Moved to the next round.
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Senior Frontend Engineer

Interviewed at Prophecy

3.7★
Oct 10, 2024

Round 2 - Architecture - 1 hour - The Frontend team lead took this round. Problem 1 - He started sharing his screen and told me about their platform and the projects they would pick up next. He showed me their UI to write Scala code for a pipeline and asked me to convert that flow to a No/Low code solution. He was continuously using jargon that someone who has already worked with their products knows - such as gems. I had to explicitly ask him to slow down and explain the flow in detail, but he constantly failed to do so. He was talking like I was a member of the team and knew everything about their product. He failed to explain his thoughts clearly and was constantly lacking communication skills. I created wireframes despite lacking context and did my best to give him a solution. He also accepted the solution. Problem 2 - Then he showed me their search component which had an icon that was trailing the text you write in that input. This icon had a jitter and delay as it was moving along with the text. He asked me how I would build and improve this component. I gave him a solution that removed this jitteriness that it had previously. He was skeptical about the solution although my solution was 100% right, I checked that post the interview as well. Problem 3 - Next up, he asked me how I would add a hashtag autocomplete in the same search input. I gave him the solution and he accepted it. He then started talking about a scrolling issue in the same, but he failed to explain what the problem was. We ended the round here. It felt more like a consultancy call instead of an interview where I was solving their product's problems and planning for new features. Result - Moved to the next round.

1. Given binary matrix write algorithm to find rectangle with largest area. e.g. [ [1,0,0,0] [0,1,1,1] [0,1,1,1] [0,0,0,0] 2. Analog to MS paint where you click a point, and all connected areas are auto filled with a color, you're given a matrix/grid with random number in it, so write a function that takes as parameters: canvas (matrix), x/y coordinates, and the color number to replace with. e.g. coordinates: 1,3, newColor:3 [[0,1,1,2,0,1] [1,0,2,2,1,1] [1,0,2,2,2,0]] so all adjacent 2's should be replaced with 3 3. Design front-end for an online chess game 4. Manager interview, just conversation about the interview process and about your background
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Senior Software Engineer - Frontend

Interviewed at Microsoft

4★
May 7, 2022

1. Given binary matrix write algorithm to find rectangle with largest area. e.g. [ [1,0,0,0] [0,1,1,1] [0,1,1,1] [0,0,0,0] 2. Analog to MS paint where you click a point, and all connected areas are auto filled with a color, you're given a matrix/grid with random number in it, so write a function that takes as parameters: canvas (matrix), x/y coordinates, and the color number to replace with. e.g. coordinates: 1,3, newColor:3 [[0,1,1,2,0,1] [1,0,2,2,1,1] [1,0,2,2,2,0]] so all adjacent 2's should be replaced with 3 3. Design front-end for an online chess game 4. Manager interview, just conversation about the interview process and about your background

Questions like: - How was your input/output in the discovery level of a new product or new feature? - As a Front-end, an OKR converted to a feature to be implemented based on what do you measure the impact of this feature to the business.
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Senior Frontend Engineer

Interviewed at Flix

4.1★
May 18, 2024

Questions like: - How was your input/output in the discovery level of a new product or new feature? - As a Front-end, an OKR converted to a feature to be implemented based on what do you measure the impact of this feature to the business.

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