remain at (something or some place)
1. To continue to be physically present at or in some place or thing; to stay (behind) at some place or thing. I wish you wouldn't remain at the office for such long hours. One of my men will remain at the station to make sure Robert arrives safely.
2. To continue to work for some company. A lot of my colleagues transferred to different companies, but I remained at FlemCo for nearly 30 years out of some misplaced sense of loyalty. He announced that he will remain at the company despite the recent allegations against him.