Nomen

der/die Hauptamtliche

Translation

full-time employee, professional staff member

Der Hauptamtliche kümmert sich darum.

The full-time employee is taking care of it.

Die Hauptamtlichen treffen sich heute.

The full-time staff are meeting today.

((as a noun)) the full-time employee The full-time employee has a lot of experience.

Angestellter (employee), Mitarbeiter (staff member), Fachkraft (specialist)

This is the adjective 'hauptamtlich' (full-time) used as a noun. It literally means 'the full-time person'.

Remember that in German, you can often turn an adjective into a noun describing a person just by capitalizing it.