Yeah, it's rgm. I'm good friends with 2-3 developers, friends with 1-2 and friends with their network guy and one of the sysadmins. All are really happy and enjoying it, and none of them are "like working for bigco" folks.
Twosigma has an office out of Houston (I recruited a bit for them (no placements) a few years ago). You sound like a good fit.