Is it permissible to work in a department of a telecommunications company that deals with banks?

If the service provided by the department to banks is used in usurious transactions, then it is not permissible to work there, due to the assistance it provides in sin, as Allah Almighty says: "And do not cooperate in sin and aggression." However, if it is not used in usurious transactions, then there is no objection to working in the aforementioned department. Similarly, there is no objection to working there in another field that is not related to serving usurious banks.