A Flex Developer is responsible for creating and managing Rich Internet Applications (RIAs) using Adobe Flex framework. They specialize in building highly interactive, data-driven applications for web and mobile platforms. Their tasks include designing user interfaces, coding, debugging, and optimizing for performance. They also work with backend developers to integrate APIs and ensure seamless data flow. They often use ActionScript , MXML, and other Flex tools for development. Moreover, they participate in testing to identify and fix bugs, ensuring the application's functionality meets user needs and expectations. They also maintain and update applications as needed.