If you are from outside the EU and want to work in a EU country, you will most likely need a work permit as well as a visa.
In order to find out if you qualify, visit the work permit section of the official government site of the country you want to work in. Don’t use any of the consultancy services that claim they can get you into the EU, as long as you pay. These tend to only charge you and won’t get you anywhere.
Here are some links for EU government sites where you can find out more: