Nouns ending in -ée are usually feminine.
The suffix often marks a duration or contents.
Is employée masculine or feminine?
l'employée
The masculine form is employé
The rule behind it
91.7% of -ée nouns are feminine
In context
Chaque patron a son employé ou employée préféré.
Every boss has his or her favorite employee.
Tout à coup, l'employée perdit son sang-froid.
All of a sudden, the clerk lost his temper.
L'employée a été escortée hors des locaux.
The employee was escorted off the premises.