You can get between any two places in SF in less than 30 minutes by hopping into an Uber/Lyft. And the distances are small enough that that trip will never be unreasonably priced.
Plus, everything that matters in tech is located in either SoMa/FiDi, Mid-Market, or the Mission, which is rarely ever further than 15min away and easily bikable / Uber-able / often walkable.
Taking a taxi everywhere seems like it would be expensive: how much would taking an Uber/Lyft 30 minutes each way to and from work actually cost?
(For reference, my commute is 30 minutes in NYC and costs me $112/month pre-tax for an unlimited MetroCard, which I can also use for non-commuting trips too)
I sometimes take Uber/Lyft or UberPool/LyftLine to and from work, which costs me ~$4-7 without surge pricing. Most of the time I walk. I probably spend ~$40/month on commute to work via Uber/Lyft, walking the rest.
That said, I'm not suggesting that as a commute option. I'm suggesting it as an option when you have to get to and from meetings at various startup offices / cafes. For commuting, most people have a good option that's cheaper than that. If you live on the other side of the city, driving or riding a scooter is not a bad option. If you live a little closer, which is likely, many people bike. There are also quite a few bus lines. There are also privately run commuter busses that connect the Marina / North Beach with downtown.
Plus, everything that matters in tech is located in either SoMa/FiDi, Mid-Market, or the Mission, which is rarely ever further than 15min away and easily bikable / Uber-able / often walkable.