Fetching details from the dictionary...

to work (for); to be employed (at); to serve (in)
to serve (as); to act (as); to fill (the position of); to play the role (of)
to conduct a religious service
銀行に勤めています。
I work at a bank.
十年間同じ会社に勤めてきた。
I've worked at the same company for ten years.
大学を出たら父の会社に勤めるつもりです。
After graduating from university, I plan to work at my father's company.