A JavaFX developer designs, creates, and maintains Java applications using JavaFX, a software platform for creating rich internet applications. They use JavaFX to develop graphical user interfaces (GUIs) with smooth, high-performance animations and web-like features. They handle event-driven programming, integrate databases, and ensure cross-platform compatibility. They also debug and resolve technical issues, optimize performance, and collaborate with other software developers. They must stay updated on new technologies and software development methodologies. Additionally, they may be involved in creating user manuals or documentation, and training end-users.