What is the ruling on working for an American company that offers products (computers and software) used by usurious banks and sensitive centers in Saudi Arabia, knowing that the work includes after-sales services in those banks? Is it permissible to work there because it is a rare job and there is a fear of less committed individuals taking control of it?

The fundamental principle regarding the sale of computers and accounting software, as well as their maintenance, is permissibility. However, it becomes forbidden if they will be used for something prohibited, such as usury (riba), because that would be considered assisting in what is unlawful, and the means are subject to the same rulings as their ends.

Therefore, it is not permissible to work in this company in matters related to assisting in usury and forbidden acts, even by writing or transferring a document. However, it is permissible to work in permissible activities that have no connection to usury. Avoiding such work altogether is preferable and more cautious.

If the monopoly of non-committed individuals over these jobs poses a clear harm to Muslims, and if the harm of Muslims engaging in these activities is lesser, then there is no objection at that time to engaging in them to avert the greater of two harms by committing the lesser. It is necessary to refer to the scholars and experts in your country to determine this.