Frontend Developer interview questions
Grouped by interview stage, with what a strong answer actually sounds like — the part most question lists leave out.
When interviewing a frontend developer, structure questions by stage and assess against the role's actual requirements. Frontend developers build the part of the product users touch. The questions below cover screening through final round, each with what a strong answer sounds like and the warning signs of a weak one.
How to use these
Pick four to six for a 45-minute interview — not all 7. A well-followed-up question takes six to eight minutes, and the information is almost always in the follow-up rather than the first answer. Ask the same core questions of every candidate so you can actually compare them; vary the follow-ups.
Screening questions
How do you approach making an interface accessible?
Why ask it: Accessibility separates people who build interfaces from people who build them for everyone. It is also a legal requirement in many markets.
A strong answer: Semantic HTML first, keyboard navigation, focus management, testing with an actual screen reader.
A weak answer: ARIA attributes sprinkled on, or "we run an automated checker" — which catches roughly a third of issues.
Tell me about a performance problem you diagnosed on the frontend.
Why ask it: Frontend performance is measurable and frequently ignored.
A strong answer: Names the metric, the tool, the actual cause, and what the fix cost.
A weak answer: Generic advice about lazy loading with no specific incident behind it.
Technical questions
When would you not reach for a framework?
Why ask it: Tests whether they understand what the framework is doing for them.
A strong answer: Discusses bundle cost, interactivity needs, and content-driven pages where it adds nothing.
A weak answer: Never, or purely aesthetic preference.
How do you handle state that several distant parts of the UI need?
Why ask it: State management is where frontend codebases usually rot.
A strong answer: Starts local and lifts only when needed; distinguishes server cache from client state.
A weak answer: Immediately reaches for a global store for everything.
A design hands you something that will be slow or inaccessible. What do you do?
Why ask it: The most common real frontend conflict.
A strong answer: Raises it early with the specific cost, proposes an alternative achieving the same intent.
A weak answer: Builds it anyway, or refuses without offering a path.
Final questions
How do you keep a component library from becoming inconsistent?
Why ask it: Predicts whether they will leave the codebase better or add to the sprawl.
A strong answer: Talks about documented usage, review discipline, and deleting near-duplicates.
A weak answer: Assumes a design system solves it on its own.
What does good collaboration with a designer look like?
Why ask it: Frontend work is a relationship as much as a craft.
A strong answer: Early involvement, feasibility feedback before pixels are final, shared vocabulary.
A weak answer: Receives finished designs and implements them without conversation.
Red flags for this role
- Cannot explain anything about accessibility
- Framework knowledge with no underlying JavaScript or CSS
- Dismissive of design input
What a frontend developer actually does
Frontend developers build the part of the product users touch. Beyond writing interface code, the role carries responsibility for performance, accessibility and behaviour across devices — the things users notice and nobody logs.
See the full frontend developer job description, including how to assess each requirement.
Generate questions specific to your role — and that account for what previous interviewers already asked — with the free interview question generator.