An Angular UI Developer designs and implements user interface components for JavaScript-based web and mobile applications using the Angular framework. They are responsible for combining the art of design with the science of programming, translating UI/UX design wireframes into actual code. Their duties include creating modules and components, and coupling them together into a functional app. They work closely with UI/UX designers and bridge the gap between graphical design and technical implementation. They also ensure high performance and responsiveness to requests from the front-end, optimizing applications for maximum speed and scalability.