This is the 17339th most frequent Polish word.
zaopatrzeniowcem
A "zaopatrzeniowcem" is a supply officer or provisioning specialist.
The sentence uses 'zaopatrzeniowcem' to describe Marek's role as a supply officer.
Zaopatrzeniowcem w naszej firmie jest Marek.
Marek is the supply officer in our company.
In this context, 'zaopatrzeniowcem' describes the job title of the individual.
Ona pracuje jako zaopatrzeniowcem od kilku lat.
She has been working as a supply officer for several years.
Here, 'zaopatrzeniowcem' refers to the person in charge of supplies that the speaker met.