Interview questions
Engineering
Frontend Engineer interview questions
Use these questions to assess a frontend engineer's depth in JavaScript, the browser, UI architecture, performance, and collaboration with design and backend teams.
14 questions across 4 stages.
Phone screen
- 1Walk me through a recent UI you built end to end — what was the hardest part?
- 2What frameworks and tooling are you most productive in, and why?
- 3How do you decide when a component should hold state vs. lift it up?
- 4What does a good developer experience look like on a frontend team?
Technical
- 1Explain the browser rendering path and where reflows/repaints come from.
- 2How would you diagnose and fix a slow, janky page?
- 3How do you handle accessibility (keyboard, ARIA, focus) in a complex component?
- 4Describe your approach to state management on a large app.
- 5How do you prevent and catch regressions — testing, types, CI?
Behavioral
- 1Tell me about a time you disagreed with a designer. How did it resolve?
- 2Describe a performance problem you owned from report to fix.
- 3How do you keep up with a fast-moving frontend ecosystem without chasing hype?
Situational
- 1A page works locally but breaks for 5% of users in production. How do you investigate?
- 2Design specs and engineering constraints conflict before a deadline. What do you do?
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