Where does “vaktmästare” come from?

vaktmästare (Swedish) comes from Swedish mästare, from Old Swedish mæstare, from Old Norse meistari, from Middle Low German meister, from Old Saxon mēstar, from Old French maistre, from Latin magister, from Proto-Italic magisteros — big, great.

vaktmästare (Swedish): A janitor, a caretaker: a broad occupation whose specifics vary by setting, but mainly responsible for maintaining a building and its outdoor areas, focusing primarily on repairs, utilities, structural upkeep, and logistical tasks such as transport or managing deliveries; compare with handyman