There are no restrictions for citizens of the European Union (EU) working in Austria. However, EU citizens must register with the local police department within three days of arrival in Austria.

For non-EU citizens living in Austria, the laws are rather strict. A visa (type D) is needed to live in Austria for three to six months. The visa may be extended at the end of the six months. The intended period of stay for business visitors may not exceed ninety cumulative days in any six-month period. The visa application must be filed before employment begins, preferably at an Austrian embassy or general consulate before arrival in Austria. Individuals who have a work permit application pending may enter Austria as visitors, but their activities must be limited to acceptable business-visitor activities.

This is just a sample of what you'll find in the complete Austria guide.