If you will be working and living in the Netherlands, your employer will have to arrange a work and residence permit (‘GVVA’) for you. This will give you permission to stay in the Netherlands and do your job.
If you will be working in the Netherlands for less than 90 days and will not have an official residence while you are here, you will only need a work permit (‘TWV’). Your employer will arrange this for you.
If you are planning to stay in the Netherlands for more than 90 days and do not have a job lined up, you will have to apply for a residence permit. To find out how to do this, visit the IND webpage on applying for a residence permit.
To find out more about Brexit and how this might affect you, visit the Brexit page on the Dutch government website.