Send an application in English (or in a Scandinavian language if you speak one) with a covering letter and a CV (maximum one page, although CVs for technical candidates might be longer and more detailed).
If sending a spontaneous application, find out the name of an HR representative to send your application to. Write a covering letter (maximum one page) and enclose a CV.
Make one application per vacancy or company. If you are applying to a large firm, call or e-mail the recruiter a few days after sending your application to ask if they have read your CV and what they think of it, whether they have received many applications, when you can expect a reply, etc.Be brief and concise in the description of yourself and your qualifications. Be honest and do not exaggerate. Keep your CV simple and modest. Be honest about your language skills, especially in English. 'Good' English skills are not the same as 'school knowledge' of English.