I have the same anecdotal evidence, but I started thinking about all SF's other industries, and the folks I see already at work when I walk my dog.
According to http://www.bayareaeconomy.org/wp-content/uploads/San_Francis... there are a lot of non-tech sectors to balance out engineer working hours (as a PM I'd usually be in by 9). Construction, transportation (hi SFO), education, healthcare, some retail and some tourism jobs will all balance out those who arrive later.
In fact, the Caltrain schedule itself reflects peak arrive-at-work hours, I'd imagine. With perhaps some disgruntled folks who get up earlier just to get a faster train (7:59, I'm looking st you.)
SF is (or used to be until recently) the West Coast's banking center, and everyone in that industry has to be ready when markets open on the East Coast at 5am Pacific.
According to http://www.bayareaeconomy.org/wp-content/uploads/San_Francis... there are a lot of non-tech sectors to balance out engineer working hours (as a PM I'd usually be in by 9). Construction, transportation (hi SFO), education, healthcare, some retail and some tourism jobs will all balance out those who arrive later.
In fact, the Caltrain schedule itself reflects peak arrive-at-work hours, I'd imagine. With perhaps some disgruntled folks who get up earlier just to get a faster train (7:59, I'm looking st you.)