The starting point is that you have to prove that there is no EU, EEA citizen or non citizen with an existing work permit available to take the position.
Alternatively, you have to show that the potential employee has some skills that are not available in the EU/EEA.
Assuming you can meet one of the above you have to present a signed work contract with a salary at least as high as the current market rate.
And then after all that you will get a limited permit, subject to quota and no guarantee of renewal.
These are the standard EU wide rules, on top of which each country may apply additional rules.
There is little interest in doing this because it is just no worth the effort.