janitor:
(plural: ‘janitors‘; female: ‘janitress‘; for the right pronunciation, please click here)

a janitor at work
(mostly in American & Scottish English) a person who takes care of a building, especially a school building, keeping it clean and also doing some minor repairs;
a caretaker;
a porter;
a person who guards or watches a door of a building,

a janitor/porter
Being a janitor at the high school for over ten years, Matthew knows much more about school, education and teachers.
The most favoured job of the immigrants is, it is believed, the janitor’s position as it demands little or no qualification and there is almost no talk with others involved while on duty.
As with other types of jobs, janitors also have unions to keep them safe from exploitation and job instability.
Though janitors are never given a thought by the residents of any building, once they are on strike, the residents realise the importance of janitors in their daily lives.
