There's a handful of places in the USA with thriving tech industry, and there's plenty of opportunity in general, but quite often people have to relocate for the really exciting opportunities. I haven't been to Spain, but my understanding of European culture is that folk generally stick around where they grew up. There's plenty of cool embedded stuff going on in Europe if you look for it. For example, I am aware of a lot of really neat drive-by-wire actuator development.