An Infragistics developer works with Infragistics, a set of user interface (UI) development tools. Their primary task is to design and develop intuitive and user-friendly interfaces for applications, enhancing user experience. They utilize Infragistics libraries to create grids, charts, and other UI elements, ensuring high performance and interactivity. They also work closely with other developers, integrating these UI components into larger software systems. Additionally, they are responsible for debugging, maintaining, and improving these UI components over time. They must stay updated with the latest Infragistics tools and technologies, ensuring optimal utilization of this suite for UI development.