Even nowadays if you are interested in doing a master’s degree in any of
the Spanish Universities you will have to prove you have a certification higher
than or equal to a level PET or a B1 according to the Common European Framework
of Reference for Languages, regardless your studies are related or not to the
studying of a foreign language.
If you know English getting a job would be much easier, either you look
for one in your country or if you are abroad in an English speaking country or
another foreign place. If the position you are looking for is related to the
world of medicine, engineering, or education, between other things, you’d
better start learning English because probably that will be the key to success.