What is the ruling on working for a company that provides services to usurious and Islamic banks, and is founded by a number of these banks?

There is no objection to working for the company if the work is permissible and not connected to anything unlawful; otherwise, it is not permissible. So, if one avoids working in matters related to serving usurious banks and limits oneself to working in services of Islamic banks and the like, then there is no objection.