Kindly refer to the following link(s):
Designing software that can be used by different companies including banks
Exclusively designing software for a conventional bank
Creating a Product or Designing a Software that can be used for both halal & haram
Software Engineer Develops For Bank Projects
Working as a Software Engineer in an interest-based Bank, income Haram?
Ruling on working for a company that has a mixture of halal & haram projects
Is my income haram if my company make me do projects for clients doing haram business