What is the ruling on a programmer working for a software company on a program unrelated to the accounting systems of a usurious bank (such as managing attendance), and what should he do?

Creating a program for a usurious bank, even if it's not for its interest-bearing accounts, is considered aiding the bank in usury, which contradicts the Almighty's saying: "And do not cooperate in sin and aggression." This also includes renting buildings or providing security for a usurious bank. Therefore, one must refrain from such work.