A Foswiki developer designs, implements, and maintains Foswiki, an open-source wiki system. They write code, primarily in Perl and JavaScript, to create new features, enhance user experience, and fix bugs. They work with databases and web servers, integrating them with Foswiki's platform. They also collaborate with other developers, reviewing code and discussing improvements. Additionally, they engage with the Foswiki community, helping users troubleshoot issues and understand features. Their goal is to ensure Foswiki remains a robust, flexible, and user-friendly platform for creating collaborative websites and web applications.