As KongFlyer says, it may well vary from country to country, depending upon your circumstances..for example:
Nationals of countries with no agreement with the EU
If you are a national of a country that has no agreement with the EU, your right to work in an EU country depends on the national laws of that country.
If you are in a family relationship with an EU citizen, you:
- do not need a work permit to work
- have the right to equal treatment, including access to all social and tax advantages.
For more information check the
EU immigration portal.
https://europa.eu/youreurope/citizen...s/index_en.htm