Full-stack developer on HoldYou, a Ukrainian mental-health platform connecting 4,300+ clients with 82 psychologists across 16 specializations. Cut mobile page-load time via route-based code splitting, lazy loading and dependency pruning - JS bundle down 42%, freeze time down 86% (760ms→110ms). Built AWS S3 backend infrastructure handling 500+ recordings/month with reliable, low-latency playback. Aligned API contracts across frontend and backend teams within agile sprints, cutting integration bugs by 30% and speeding up releases.
