The work visa must be applied at the relevant consulate in principle before you start of work in the third country. There are destinations with different options for a work visa. Each category may have different processes regarding:
Which visa for the specific case applies and seems advisable, must be assessed individually. Decisive factors are such as:
In each case relevant documentation on the qualifications and the proposed activity (eg. a concrete job offer, job description, employment contract) have to be submitted.
We are happy to assist you in applying for a work visa.