When you are studying and living in Bilbao you might consider a part-time job. Not only will you earn some extra money, you will also gain important knowledge of the Spanish language. Being surrounded by Spanish speaking people all the time will really help you to improve your Spanish language skills. There are a variety of jobs available in Bilbao, you just need to look around until you find something that you feel suits you. When looking for a job, do not mention your salary first. It is common to discuss the payment after you have been hired.
The main newspapers publish Sunday supplements with major vacancy overviews:
‘El País’ issues ‘Negocios’ - ‘El Mundo’ issues ‘Su Dinero’ - ‘El ABC’ issues ‘Nuevo Trabajo’
Regional papers are extremely important in their respective areas:

‘La Vanguardia’ in Catalonia – ‘La Gaceta del Norte’ in Bilbao - ‘Segunda Mano’ in the Madrid region

Successful way of getting a job: 
Personal contacts – the following things can be undertaken by you: You can use a temporary job, a summer job or an internship as a steppingstone on your way to a permanent job. Your first job provides you with the right contacts for your second job - that’s the way it goes here in Spain!

S.E.L. The Student site for student jobs in Spain, Germany, France and UK,

www.starteasyliving.com 
InfoJobs The job listings website in Spain and offers many qualified and professional positions.

Loquo The local announcement website addressing any kinds of needs, good for flat and job hunting.

Habitamos España An interesting new web platform for classifieds in all Spain, thus also for Barcelona jobs.

ServiJob Service by La Vanguardia Spanish newspaper

Eurojobs pan-European job portal

Internships - Internship Offers - Internships Abroad - Internship Companies -

Jobs - Job Offers - Jobs Abroad - International Jobs - International Job Offers -

International Companies - Career Companies - Big Companies - Best Companies -