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If you wish to come to Norway to work, you need a residence permit. You must normally find a job first. The type of residence permit you should apply for depends on your competence and the type of work you will be doing in Norway.
When you are applying for a residence permit for work from abroad, your employer or client must in many cases confirm your job offer before you can submit your application form. This is a new measure introduced to help reduce fraudulent job offers. You will find a separate section about confirmation of a job offer for the types of work permit where this applies.