What is the ruling on working for a software company that deals with both permissible (halal) projects and others based on usurious interest, and is the salary earned from the permissible projects considered halal, and what is the ruling on managing the impermissible projects in this company?

Usury (riba) and assisting in it are forbidden, based on the Almighty's saying: "And do not cooperate in sin and aggression," and the Prophet's (peace be upon him) saying: "Allah has cursed the one who consumes riba, the one who gives it, the one who records it, and the two witnesses to it." Therefore, one who works in preparing usurious programs is assisting in riba, and their work is impermissible. However, working in another permissible field that has no relation to riba is allowed.