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• Designed and implemented mobile-first responsive web layouts utilizing HTML5, CSS3, and JavaScript modern frameworks. • Collaborated on translating Figma/Adobe XD wireframes and UI designs into fully functional, pixel-perfect web interfaces. • Optimized mobile web page performance, asset rendering times, and touch-interaction elements to enhance user engagement. • Bridged backend logic built via Python frameworks (Django/Flask) with seamless frontend components optimized for handheld screens. • Conducted comprehensive cross-browser and multi-device usability testing to ensure a consistent look and feel across iOS and Android.