I'm really glad somebody asked this, because I'm the CEO of Fog Creek and I had no idea what Joel was talking about with that. :)
Hopefully one of the early things you'll be focusing on is the diversity of GoMix's technology (including building accessibility in by default) and its community. There's huge potential, and a great chance to address it at a relatively early stage.
It seems like the positions listed here http://www.fogcreek.com/careers are support roles instead of product roles.