I got promoted to section manager last month.
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.
My section manager is kind of annoying. He is always trying to impress the other workers.
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.
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.