Others have pointed out a few "real" tech companies, but the economy is also surprisingly large. There are a ton of little data science jobs available on the market, though they're mostly on initiatives that will never plausibly work.
Folks end up at all sorts of places. Like I mentioned above, the banks hoover up a lot of graduates. There are a lot of smaller local companies doing web stuff. The consulting companies all have a presence here (KPMG, Accenture, Fujitsu Consulting, etc).
Which is odd since their universities have built two of the most interesting CS projects I can think of (Mercury and L4). And WWWJDIC I suppose.