delivery worker; delivery staff
Refers to a person whose job is to deliver packages, mail, or goods. Neutral, everyday term.
The delivery worker brought the package.
He works as a delivery staff member for a home-delivery company.
宅配便 refers to the home-delivery service itself, not the worker.
Compound of 配送 (delivery, shipping) and 員 (member, staff). A straightforward modern occupational term.