Members of the Xubuntu team take care of Xfce and other packages that are part of the default Xubuntu install. The work includes packaging, coding, artwork, documentation, translation and testing.

Please note that only users who have contributed to Xubuntu perpetually will be approved to the team. Thanks for your interest and understanding.

To start contributing now, navigate to http://xubuntu.org/contribute/. The page will give you some good starting points to get involved as well as list the areas where you can help.