Frontend Developer Interview Preparation

What interviewers may evaluate

• Depth of JavaScript and TypeScript knowledge, not just syntax.
• How you reason about rendering, performance and user experience.
• Accessibility awareness as a default, not an afterthought.
• How you structure components and state as an interface grows.
• How you collaborate with designers on the visual and interaction details.

Common interview topics

Common areas may include JavaScript runtime behavior (event loop, closures, async), TypeScript types, the DOM and browser APIs, CSS layout and specificity, React or the framework the team uses, web performance, accessibility (WCAG, keyboard support, semantics), and frontend architecture for growing codebases. For the server-side counterpart, see backend developer interview preparation, and for the design-adjacent side of the work, the UX designer interview preparation.

Typical questions

• Explain the event loop and why this code prints in this order.
• How would you improve the performance of a slow page?
• When would you reach for a state library instead of local state?
• How do you make this component accessible?
• What CSS approach would you use for a large design system?

Behavioral questions

• Tell me about a time a design was technically impractical and how you handled it.
• Describe a performance problem you diagnosed in a browser.
• Tell me about a time you pushed back on a product or design decision.

Role-specific questions

Expect real-world scenarios more often than abstract puzzles: taking a component from a design spec to production, handling data fetching and loading states, keeping a growing codebase consistent, and explaining the trade-offs of the team's framework and tooling. Practice building a small interface while narrating your decisions. For the broader technical interview format, see technical interview questions.

How to prepare

• Solidify core JavaScript/TypeScript: closures, async, types, the DOM.
• Be ready to audit a page's performance and accessibility out loud.
• Review the company's frontend stack and public component work.
• Prepare stories about real UI problems: a tricky interaction, a layout bug, an a11y fix.

Common mistakes

• Answering with memorized definitions instead of demonstrating understanding.
• Ignoring accessibility until it is explicitly asked about.
• Over-engineering toy solutions with patterns that would be overkill in production.
• Not connecting answers to the actual UI problem the team faces.

What strong preparation looks like

Strong preparation shows you think in terms of the user and the browser: you can talk about a component's performance budget, its accessibility behavior, and how it degrades — because that is how production frontends actually fail.

How Interviou personalizes preparation

Interviou builds questions from your CV and the job posting: technical depth tied to the stack in the posting, behavioral answers grounded in the frontend problems you have actually shipped, and the gaps in your background you should be ready to address.