I'm actually rather shocked that 37 signals only has 9 engineers on board (presumably DHH isn't included in this number). I remember reading that the company has 30-40 employees [1]. I'd really love to know what the other 20-30 do, and what the other (relatively) heavily staffed groups are (I'd imagine technical support would be one of them).

[1] Ah yes, 1 year ago they had 32 employees. http://37signals.com/svn/posts/3188-from-4-to-32-people-in-e...