Most discussion of employment is for the San Francisco metro area, but I think the county level statistics at https://data.census.gov/profile/San_Francisco_County,_Califo... are actually specific to people who live in San Francisco.

I never know what business codes / job codes get included in "Professional, scientific, and management, and administrative and waste management" but there's an explicit separate one for Information that is only 6.3% (https://data.census.gov/vizwidget?g=050XX00US06075&infoSecti...)

People write about tech jobs because they're highly paid (on average) and highly visible. But it's not the case that the city is entirely dependent on technology. You wouldn't say the same thing about the equally large segment of "Finance and insurance, and real estate and rental and leasing".