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Frontend Software Engineer Interview Questions

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869 frontend software engineer interview questions shared by candidates

Quando usar SSG ou SSR? Quando não usar? Como garantir que o deploy de centenas de páginas em um horário agendado sem erros? Como melhorar o SEO de uma página? (aparentemente o entrevistador entendeu que fazer análise por ferramentas como semrush e trabalhar em html semântico, acessibilidade, metadados, etc. não seria suficiente). Você usa ferramentas de monitoramento tipo Datadog? E como? Como fazer otimização de imagens?
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Analista de Engenharia de Software Pleno - FrontEnd | Remoto

Interviewed at Cartão Elo

3.9★
Apr 17, 2025

Quando usar SSG ou SSR? Quando não usar? Como garantir que o deploy de centenas de páginas em um horário agendado sem erros? Como melhorar o SEO de uma página? (aparentemente o entrevistador entendeu que fazer análise por ferramentas como semrush e trabalhar em html semântico, acessibilidade, metadados, etc. não seria suficiente). Você usa ferramentas de monitoramento tipo Datadog? E como? Como fazer otimização de imagens?

What optimizations could be made here (in the original solution I submitted)? The results being shown are not correct as seen in the database, why do you think that could be happening (there was a bug that was intentionally placed in the codebase)?
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Frontend Software Engineer

Interviewed at Clipboard

3.7★
Dec 13, 2025

What optimizations could be made here (in the original solution I submitted)? The results being shown are not correct as seen in the database, why do you think that could be happening (there was a bug that was intentionally placed in the codebase)?

For the take home test, they give you a design spec and some mock APIs and ask you to implement a dashboard with certain constraints. They asked a few more general technical questions about JavaScript concepts like promises, async/await, etc. The rest of the interviews consisted mostly of "tell me about a time when..." and "how would you handle this situation" types of questions.
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Software Engineer, Frontend

Interviewed at Syndio

2.3★
Nov 1, 2022

For the take home test, they give you a design spec and some mock APIs and ask you to implement a dashboard with certain constraints. They asked a few more general technical questions about JavaScript concepts like promises, async/await, etc. The rest of the interviews consisted mostly of "tell me about a time when..." and "how would you handle this situation" types of questions.

Question 1: Write an efficient algorithm for the following assumptions: • N is an integer within the range 1..100,000]; each element of array A is an integer within the range [-1,000,000..1,000,000]. Question 2: Make a Fibonacci algorith that returns only the last 5 decimals. (Use matrices)
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Software Engineer – Frontend/Fullstack

Interviewed at HolidayCheck Group

4★
Jan 5, 2022

Question 1: Write an efficient algorithm for the following assumptions: • N is an integer within the range 1..100,000]; each element of array A is an integer within the range [-1,000,000..1,000,000]. Question 2: Make a Fibonacci algorith that returns only the last 5 decimals. (Use matrices)

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