Section Manager
Section Chief
noun, suffix
Remember how 社長 is the company president? This uses the same 長 meaning (where it means something like "boss"). Since 課 means section, this is the section manager.
かちょう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
先月、課長にしょう進しました。
I got promoted to section manager last month.
課長になれたのはうれしいんだけど、ざん業代が出ないから実はきゅう料が下がったんだよね。
I'm glad I was able to become a section chief, but my pay has actually decreased because I don't get paid for overtime.
課長が少しうざいんだよね。他の社員に良い印象を与えようといつも頑張っちゃってさ。
My section manager is kind of annoying. He is always trying to impress the other workers.