This is a similar route my company has taken. We are based in Madrid and are just about to break out of Spain in terms of customer base. We are more a traditio

This is a similar route my company has taken. We are based in Madrid and are just about to break out of Spain in terms of customer base. We are more a traditional company competing in an existing industry hence Silicon Valley is not a location we compete with in terms of culture or product design. What has been a big challenge for us after switching to English has really been acquiring local talent that is already here or willing to move here, can speak English well and also have great coding skills (in C# .Net if you want to know) We have been successful in recruiting people in rural Spain and across Europe but it seems that all the English talent in MAdrid already is quite comfortable in their jobs. So in summary - I think if you are in non-english Europe and do the switch, be prepared to diversify your operations and look at remote workers or branch offices away from your HQ. YMMV of course.