I've been working professionally as a system administrator since 2007, as a side job to my studies.
Before that and still going strong, I administrate a couple of private servers on non-professional basis, including some of my own.
I also take part in the organization of events, like the Easterhegg 2008 and the SIGINT 2009 and 2010.
Furthermore, I organized the U23 2009, a series of lectures by the C4 aimed at educating young people in the arts of technology.