Employment and Spain seem to be non-compatible words nowadays, and many young people here find ourselves forced to look abroad for work, so it really takes a lot of courage to come here to make a living. Jokes aside, welcome to the place! I'm involved and also know a few
permaculture (or "eco" which seems to be the adjective we use more around here"-related initiatives) around here, and unfortunately as of now they are quite timid to provide a way of living for their participants, and most of them are done in a
volunteer basis.
In your specific career, for example, I can recall a group of architects and related people around here I recently met who are attempting to perform small constructions with local-found
reed, which is an ancient technique nearly gone. They seem to be quite serious about their efforts, and they are even trying to develop and propose to the authorities a legal building code for it. They also cut the reeds (on February) and build them for the people and collectives interested at the time, at least for now. I found that very interesting and worth following. Their website is
this one (in Catalan and Spanish, but translatable via google translate).
In other areas, like food and such... well, not so much, really. In Catalonia there's the
Cooperativa Integral Catalana, who has plenty of projects, but I'm still to see the success of many of them, and I'm quite skeptic at the moment. Then, during this past years, there are some people who has been trying to do, mostly as individual or familiar, small-scale agriculture like community supported agriculture, selling eco veggies, eggs and a few other things, but they are scattered around the country and often as purely individual enterprises who can't afford to get bigger and hire people.
Well, good luck in your search then, really hope you can find your way here.