Dude, it's actually not a problem at all.
I know a lot of English speakers who are just teaching without having to know a single word of Spanish.
It really depends from the kind of job, all the restaurants/bar require Spanish and Catalan as you'll interact with the general public.
Otherwise there are a lot of job opportunities over here for English speakers, for instance in the company I work for the only requirement was native english and an extra language was just a bonus.