€100K is not really setting the bar all that high. It's a shame to see so many replies here that consider it to be impossible.
Personally, since living in Europe, I've done it two ways. I worked remotely for an American company for several years, at my butt-in-seat Bay Area rate. And I've bootstrapped my own SaaS product business (letting it grow in the background while working for that US company).
Another option would be to find a software company here and actually negotiate a market rate for one's self.
It's really expensive to live here, compared to the 'states. I don't see how anybody does it on the $35k/year salaries we see reported for software guys.