Intermediatebehavioral
Tell me about a time you significantly improved the performance of a web page or frontend feature. What was the impact?
Frontend Developer
General

Sample Answer

(Situation) On a product listing page for an e‑commerce site, users were experiencing 6–7s load times and a high 65% bounce rate on mobile. (Task) I was asked to diagnose and improve perceived performance without changing backend APIs. (Action) I started with Lighthouse and Chrome DevTools to profile the page. I found we were shipping a 1.5 MB JS bundle and unoptimized hero images. I implemented code splitting with dynamic imports for non-critical components, reduced bundle size by ~40%, and enabled tree-shaking by reorganizing imports. For images, I introduced responsive images with srcset and WebP, and lazy-loaded offscreen content using IntersectionObserver. I also inlined critical CSS and deferred non-essential scripts. (Result) First Contentful Paint dropped from 3.8s to 1.9s and Largest Contentful Paint from 5.9s to 2.7s on 3G. Mobile bounce rate decreased from 65% to 47% over four weeks, and conversion on that page increased by 9%. These improvements were documented and turned into a performance checklist for future features.

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