Well, crap. I wish I'd noticed they were hiring.
For the Admins
There is a core team of seven people. They worked on this game since 2008. They can be spotted on the forums (may not be their in-game names) as:
Nick
Blackhat
Andrzej
Mjohnson
Wtfwtf_ok
Jcollie
Corey
You can also get a glimpse of some of the history at Three Panel Soul. Some more of the history can be caught by heading over to the SK facebook page and viewing some of the videos they linked.
Currently we have three programmers (Mjohnson, Wtfwtf_ok, and me), two artists (Blackhat and Corey), two level designers (Jcollie being one), one level design intern, and one lead designer (Nick).
The job post above was specifically for support personnel. We have a page here for development jobs.
Thanks for answering my questions. I was genuinely interested in knowing.
http://forums.spiralknights.com/en/node/1643
That was their latest hiring time.