What is the ruling on working for a company that deals with usury (riba), or working as an accountant who reviews its usurious transactions, or as a driver for a stock exchange company?

It is not permissible to work in interest-based (usurious) companies in matters related to interest, even if it is writing or carrying a paper, due to the prohibition of cooperating in sin, and because the Messenger of Allah, peace and blessings be upon him, cursed the one who consumes usury, the one who feeds it, its scribe, and its two witnesses. As for working in permissible matters that have no connection to usury, there is no harm in it, though it is preferable to avoid it.

Accordingly, it is not permissible for someone who deposits checks for an interest-based company's account to work there, nor for an auditor who reviews an interest-based bank's account and its interest. However, it is permissible for someone who writes salary checks or entitlements, and for someone who disburses them, to work there.

As for working as a driver for stock exchange companies, it appears there is no objection to it, as long as the company's work is not exclusively in prohibited transactions.