For longer stays, you should apply to the appropriate office for a residence permit.
A residence permit issued by the Home Office to a national from a European Economic Area country or Switzerland.
If you have been offered a position expected to keep you in Sweden for longer than three months, you will also need a residence permit.
If you're planning to go to work in Finland, you'll need to obtain a residence permit for an employed person unless you are a resident of one of the European Union nations.
If you visit the country with a visa, you'll be required to obtain a residence permit before you can accept paid employment in the country.