This is the 17469th most frequent Polish word.
zatrudniony
"Zatrudniony" means "employed" in English.
Here 'zatrudniony' is used as a past participle indicating that somebody has been employed, describing Jan's new job status.
Jan został zatrudniony na stanowisko księgowego.
Jan has been employed in the position of accountant.
Here 'zatrudnieniem', derived from 'zatrudniony', functions as a noun referring to the act of employing people.
Firma ma problemy z zatrudnieniem odpowiednich osób.
The company has issues with employing suitable individuals.
Here 'zatrudniony' is used as an adjectival participle to describe the worker who has recently been employed.