chef de partie
US /ˌʃef də ˈpɑːr.ti/
UK /ˌʃef də ˈpɑːr.ti/

1.
a chef in charge of a particular section of a kitchen
:
•
The chef de partie for the pastry section prepared the desserts.
•
He started his career as a commis chef and quickly rose to become a chef de partie.