- Stages
- 5
- Typical timeline
- 3 to 5 weeks
- Difficulty
- Medium
- Format
- Technical screen, practical task, then a loop
Frontend interviews mix general coding with practical web work. Expect JavaScript fundamentals such as closures, the event loop, promises and how the DOM works, plus a live task like building a component, fixing a layout or fetching and rendering data. Many companies ask a frontend system design question, for example designing a news feed or an autocomplete, where you discuss state, performance, caching and accessibility. Interviewers look for clean component structure, attention to user experience and an understanding of why a page is slow. Showing that you care about accessibility, test your code and can work closely with designers sets strong candidates apart.
The interview process, stage by stage
- Recruiter screenExperience with frameworks, products you have built and motivation.
- Technical screenJavaScript fundamentals and a small coding problem.
- Practical taskBuild or fix a UI component, live or as a take-home.
- Frontend system designDesign a complex interface such as a feed, chat or autocomplete.
- BehaviouralCollaboration with design and product, ownership and quality.
How you're scored
Understands JavaScript, the DOM and how browsers render.
Builds components that are accessible, responsive and pleasant to use.
Structures state and components sensibly for the size of the problem.
Works well with designers and handles feedback.
Likely Frontend Engineer interview questions
Explain the JavaScript event loop.
A strong answer includes: Describe the call stack, task queue and microtask queue, when promises run relative to timers, and give a short example of the resulting order.
Build an autocomplete input that fetches suggestions as the user types.
A strong answer includes: Debounce requests, cancel or ignore stale responses, handle loading, empty and error states, and support keyboard navigation with correct ARIA roles.
Implement a debounce function.
A strong answer includes: Return a function that clears and resets a timer on each call, preserves arguments and this, and optionally supports an immediate first call.
Every question for this interview, with what strong answers include. Free with an account for the first few; all of them with Pro.
Common mistakes
- Ignoring keyboard and screen reader users
- Reaching for a library to solve everything
- Not handling loading and error states
- Weak explanations of why something is slow
Questions to ask them
- How do designers and engineers work together here?
- What does the frontend testing setup look like?
- How do you measure and track performance?
- What is the biggest frontend challenge the team is facing?
Candidate experiences
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Share your interviewFrequently asked questions
What is asked in a frontend developer interview?
JavaScript fundamentals such as closures, promises and the event loop, CSS layout, a practical task like building a component or fixing a bug, and often a frontend system design question. Senior roles add questions on architecture, performance and accessibility.
How do I prepare for frontend system design?
Practise designing interfaces like a news feed, autocomplete or chat. Cover the component structure, where state lives, how data is fetched and cached, pagination, performance, error handling and accessibility. Draw the components and data flow as you talk.
Do frontend interviews include algorithms?
Many do include one coding problem, usually at an easier level than backend roles. Common topics are arrays, strings, recursion over nested data and implementing utilities like debounce or a simple event emitter.
How important is accessibility in frontend interviews?
Increasingly important. Interviewers notice whether you use semantic HTML, label form fields, support keyboard navigation and manage focus. Mentioning these without being asked is a strong signal.
