All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
If your administration of the finances of this company includes usurious interest or even helping others to be engaged in it, such as depositing money to get usurious interest or investing in treasury bills, then, in that case, it is impermissible for you to work in it unless there is a necessity, such as an inability to get the necessary expenses from other lawful sources. So, if you find another lawful source, you must leave your work in that company.
However, if your work had nothing to do with usurious transactions and the company's activity is, in essence, lawful, yet, it sometimes engages in some usurious transactions, then it is permissible to work in it in this case.
Allah knows best.