Frontend Engineer Interview Questions
Questions for evaluating frontend developers on React, CSS, performance, and system design.
Technical Questions
Walk me through how you'd architect a complex form with dependent fields, validation, and error handling.
Follow-up questions
- How would you handle async validation?
- What state management would you use?
What to look for
Understanding of controlled components, form libraries (React Hook Form/Zod), and separation of concerns.
How would you implement an accessible dropdown menu from scratch?
Follow-up questions
- What ARIA attributes would you use?
- How would keyboard navigation work?
What to look for
Knowledge of WAI-ARIA patterns, focus management, and screen reader compatibility.
Behavioral Questions
Tell me about a time you had to optimize a slow React application. What was the problem and how did you fix it?
Follow-up questions
- How did you measure the improvement?
- What tools did you use to profile?
What to look for
Experience with React DevTools, memoization, code splitting, and measurable performance gains.
Describe a project where you had to work closely with designers. How did you handle design-to-code handoff?
Follow-up questions
- What tools did you use?
- How did you handle design changes mid-sprint?
What to look for
Cross-functional collaboration, design system awareness, and flexibility.
Situational Questions
You discover a critical CSS layout bug 30 minutes before a demo. What do you do?
Follow-up questions
- How do you communicate the issue?
- When would you ship a quick fix vs. delay?
What to look for
Problem-solving under pressure, communication skills, and pragmatic decision-making.
Culture Fit Questions
What does your ideal code review process look like?
Follow-up questions
- How do you handle disagreements in code reviews?
- What do you prioritize when reviewing?
What to look for
Collaborative mindset, constructive feedback approach, and attention to both correctness and readability.
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