Front End Software Engineer Interview Questions

852 front end software engineer interview questions shared by candidates

Can you explain the difference between the Task (Macrotask) Queue and the Microtask Queue in the JavaScript Event Loop? Specifically, how does the browser prioritize Promise resolutions over scheduled callbacks from a setTimeout function, and what impact does this have on UI rendering performance?
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Software Engineer - Front End

Interviewed at Amazon

3.5
Mar 25, 2026

Can you explain the difference between the Task (Macrotask) Queue and the Microtask Queue in the JavaScript Event Loop? Specifically, how does the browser prioritize Promise resolutions over scheduled callbacks from a setTimeout function, and what impact does this have on UI rendering performance?

Step 1: - HR Screening Step 2: - Code Interview, 2 LeetCode style questions Easy/Medium Step 3: - Code Interview - 1 LeetCode style Medium/Hard - System Design Step 4: - FE Code Interview - React - Manager/Culture Interview
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Front End Software Engineer

Interviewed at Datadog

4
Jan 25, 2024

Step 1: - HR Screening Step 2: - Code Interview, 2 LeetCode style questions Easy/Medium Step 3: - Code Interview - 1 LeetCode style Medium/Hard - System Design Step 4: - FE Code Interview - React - Manager/Culture Interview

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