This is the 1381st most frequent Japanese word.
係長
Assistant Section Manager.
Here, 係長 (assistant manager) refers to a specific job position within an organization's hierarchy.
新しい係長がプロジェクトのリーダーを務めています。
The new assistant manager is serving as the leader of the project.
In this context, 係長 (assistant manager) is used to describe the role or title that the speaker's father holds in his workplace.
私の父は係長として働いています。
My father works as an assistant manager.
Here, 係長 (assistant manager) indicates the person occupying the assistant manager's position whose decisions impact operations.