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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.
The Norwegian immigration authorities have recently seen an increase in scams targeting individuals applying for temporary work permits in Norway. Scammers falsely claim they can secure jobs, often demanding payment in exchange for fraudulent work offers. You will find more information about fraudulent work offers here.