In this technical presentation, Georgii Perepechko leverages his deep expertise in frontend development at Signal Ocean, Meta, and Yandex to explore advanced UX/UI strategies that optimize both performance and user experience. The talk will cover how to implement highly performant React applications while maintaining a seamless and intuitive UI. Attendees will learn how to bridge the gap between cutting-edge frontend technologies (like React hooks, lazy loading, and dynamic imports) and human-centered design principles. By diving into case studies and real-world challenges, Georgii will demonstrate how to create fast, scalable, and visually engaging interfaces without sacrificing performance. Tools such as Lighthouse, Figma, and browser dev tools will be used to show how to monitor, test, and optimize every aspect of a digital product, from load times to interactivity.