As you can only work for three months with one employer , it can be hard finding something in your chosen career. It may be easier to do temporary and seasonal work. Email yourself a copy of your CV so that you can access it at the touch of a button. The EN is a nationwide chain of government job search agencies. Most have boards with vacancies listed.
Some centres specialise in specific job markets, such as hospitality.
The main task of the EN is to find jobs for locals so it may take a while to get a job through it, but it is good for harvest workers. Hostels Hostels offer good local information on jobs and can often even arrange work for travellers at building sites, factories and in sales. Newspapers Newspapers are full of job ads. You'll have to move quickly or consider staying up late to get the first edition early in the morning. Some publish classifieds on the internet before the paper hits the streets.