I've been editing Wikipedia as a hobby since 2008 and have found that editing hones a skillset, if modest, of some utility. Apart from the addition of (hopefully useful) content—the reason I joined and the reason I stay—most of the work I do on Wikipedia is of the low-key variety: copyediting articles, working at CSD/AIV/UAA, various routine maintenance, documenting historical U.S. elections, and generally keeping house at articles covering a multitude of subjects that interest me.
I became a Wikipedia administrator in 2011, allowing me to access a few additional tools and buttons on the technical side. I use that toolset mostly in the background, on a volunteer basis, to help keep things running smoothly wherever and whenever I can. If you think I can be of assistance, have a question, or would like to offer constructive criticism—administratively or otherwise—then I welcome and invite you to leave me a message; I will be glad to make your acquaintance if I have not already.