A Material UI developer creates and implements user interface designs using Material-UI, a popular React UI framework. They are responsible for crafting visually appealing and intuitive interfaces that enhance user experience and interaction. Their work involves developing reusable components and front-end libraries for future use, optimizing components for maximum performance, and ensuring that the web design is responsive for all devices. They also work closely with UX/UI designers and back-end developers to ensure seamless integration. Additionally, they often use tools such as JavaScript, React, and other Material-UI components to achieve their goals.