Software developer at yWorks GmbH.
Usually I'll answer questions here about Java, C#, PowerShell, batch files, random numbers, regular expressions and Unicode. At work I primarily deal with C++, C#, PHP and a few other things.
My interests are mostly HCI, Interaction Design and UX. Recently I18n joined that list as well. That does not mean I have profound knowledge in either of those fields, just that I am interested in them.
Note: People contacting me outside SO/SE is fine, but for discussing their own questions or answers SO already provides a mechanism, namely edits and comments. So please use those things first.
I do hang around on Freenode as Hypftier, though.