A Greenfoot developer is primarily engaged in designing and developing interactive games, simulations, and graphical programs in a visual and interactive environment. They leverage the Greenfoot platform, which is specifically designed for educational purposes to teach object-oriented programming languages, such as Java. The developer's role involves creating actors, defining their behavior and interaction, implementing the program logic, and testing the software for bugs. They also set the scenarios in which the actors will function. A significant part of their job is making complex programming concepts understandable for students or novice programmers. They are responsible for ensuring an engaging and effective learning experience.