Frontend Developer Interview Questions

Keep it to about 90 seconds and structure it as present → past → future: what you do now as a frontend developer, the experience that got you here, and why this role is the next step. Anchor it in your strongest areas — for this role that usually means JavaScript / TypeScript and React — and end on why you're excited about this specific company. Don't recite your resume; tell the story it summarizes.

Answer in two halves: something specific about the company (product, mission, team — proof you did homework) and something specific about the work itself. Vague enthusiasm reads as "I applied everywhere." Tie your answer to the parts of the job description you're strongest in, using their own language — terms like React and TypeScript.

Pick two you can prove, not five you can list. For each, pair the strength with a concrete result — e.g. "Rebuilt the marketing site in Next.js, improving Lighthouse performance from 58 to 96 and lifting signups 14%." is far more convincing than "I'm detail-oriented." Choose strengths the job description actually asks for.

Don't rate yourself — tell a story. Name a specific project where you used JavaScript / TypeScript, what you did with it, and what changed because of it (a number if you have one). Interviewers ask this to separate people who listed JavaScript / TypeScript on a resume from people who have actually shipped work with it.

Don't rate yourself — tell a story. Name a specific project where you used React, what you did with it, and what changed because of it (a number if you have one). Interviewers ask this to separate people who listed React on a resume from people who have actually shipped work with it.

Don't rate yourself — tell a story. Name a specific project where you used Next.js, what you did with it, and what changed because of it (a number if you have one). Interviewers ask this to separate people who listed Next.js on a resume from people who have actually shipped work with it.

Don't rate yourself — tell a story. Name a specific project where you used HTML / CSS, what you did with it, and what changed because of it (a number if you have one). Interviewers ask this to separate people who listed HTML / CSS on a resume from people who have actually shipped work with it.

Pick a real mistake with a bounded blast radius, spend one sentence on what went wrong, and the rest on what you did: how you caught it, fixed it, and what you changed so it can't recur. Never pick a fake mistake ("I work too hard") — interviewers ask this to test ownership, not perfection.

Show that you disagreed on substance, listened, and resolved it with evidence rather than authority. End with the outcome and the relationship intact. For a frontend developer, this often involves trade-offs around JavaScript / TypeScript — a real example from that territory lands well.

This is the moment for your single best quantified result — the "Rebuilt the marketing site in Next.js, improving Lighthouse performance from 58 to 96 and lifting signups 14%." class of story. Use STAR (below) so it has a beginning, middle, and end, and make your specific contribution unmistakable. The most common failure here: no portfolio or live link to actual work.

Interviewers ask this because every frontend developer role changes under you. Pick a tool, domain, or process you ramped on under a deadline, describe how you learned (docs, experts, deliberate practice), and finish with what you delivered. It's a chance to show method, not just adaptability.