noun
worker; employee; person on duty
Refers to people who work at a particular place or are on duty, often in an official or organizational context.
このビルには多くの勤務者が働いている。
Many workers are employed in this building.
夜間の勤務者は少ない。
There are few people on duty at night.
職員 often refers to staff members of an organization, especially in public or institutional settings, whereas 勤務者 can be used more broadly for anyone working at a location.
Compound of 勤務 (kinmu, 'work, duty') and 者 (sha, 'person').