This is the 12848th most frequent Russian word.
курьер
Courier.
Here, 'курьер' is used in an occupational sense, indicating the speaker's job.
Я работаю курьером в крупной компании.
I work as a courier in a large company.
In this sentence, 'курьер' refers generally to a service where a courier can be summoned for task execution.
Существует услуга вызова курьера прямо домой.
There is a service for calling a courier directly to your home.
Here, 'курьер' refers to a person acting as a delivery courier for parcels or goods.