What is the ruling on designing a program for an interest-based bank, knowing that the employee will be fired if he refuses?

It is not permissible to design a program for a usurious bank, as it involves assisting in usurious transactions, which is forbidden. If the company's manager compels an employee to do this work, it is not permissible for the employee to undertake it, and he is entitled to his full wages due to the absence of a reason for dismissal. However, necessities permit the forbidden, and are estimated according to their measure.