Well, if the UK leaves the EU my rights would be affected. Also I expect a few years of bad economy after the decision where it will be easy to blame other European countries for every problem. So the future doesn't look very promising if we stay.
I was considering Berlin, Amsterdam and Madrid (we are originally from there, so it's the obvious place to come back to, even if the situation there is less than ideal).
I am afraid I cant comment on the job situation. Its probably not exactly the European counterpart of Silicon Valley :) but they nonetheless have a fair share of IT companies. Maybe check out http://www.karriere.at/jobs/edv-it-organisation?states%5B0%5...
As for the city, yes it's quite a nice one, good infrastructure, lots of cultural heritage, nice environment and so on .... for the past six years it ranked #1 in Mercer's list of quality of living survey. Though to be fair, last time I was there I do admit I had the impression some things changed and it seems it has become less safe recently. So that might be something to consider as well.
Any particular cities you'd consider?