Typically refers to a person who manages a building, apartment complex, or facility, handling maintenance, tenant relations, and daily operations. Often used in contexts like マンション管理員 (condominium manager) or ビル管理員 (building manager).
See also: 管理士
The apartment building manager replaced the light bulb in the hallway.
管理員にゴミ置き場の場所を聞いた。
I asked the building manager where the garbage collection area is.
管理人 is a more general term for a manager or caretaker of a place, website, or group, whereas 管理員 is more specifically used for building or facility administrators.
Compound of 管理 (kanri, 'management') and 員 (in, 'member' or 'personnel'), literally 'management staff member'.