Does JAA work? Can you really get work abroad?

[Euroatlantic]

Hi. I'm thinking of starting my flight training soon. I'm considering getting a JAR license in Spain and then lookign for work all around Europe.
But is that possible really? Can you really get work abroad? Or do local companies prefer local pilots? ( for example, can a spanish find work with a UK operator as long as he's more qualified than a british pilot?)

Thanks!