Well, a lot, according to what media keep saying for the last like 10+ years. They usually don't go into too much detail, but from what I can remember:
- Medical staff, especially nurses (Pfleger)
- MINT graduates (MINT -> M for mathematics, I for Informatik which is the German name for computer science, N for natural sciences and t for technology). Among these, engineering related subjects seem to be in most demand. The demand for these can vary quite a lot depending on location.
- School teachers (Lehrer), especially elementary school teachers (Grundschullehrer)
- Trained craftspeople (Handwerker) of most fields
Since this is not from personal experience, take my word with a grain of salt.