Working for a company; being employed by a company (as opposed to self-employment or freelance).
彼女は大学を出てからずっと会社勤めをしている。
She has been working for a company ever since graduating from university.
会社勤めは安定しているが、自分の時間が取りにくいこともある。
Working for a company can be stable, but it can also make it hard to have personal time.
地方出身の彼は都会で会社勤めを始めた。
He, who is from a rural area, started working for a company in the city.
会社勤めと自営業、どちらが自分に向いているか悩んでいる。
I'm wondering whether working for a company or running my own business suits me better.