What is the ruling on working for a company that supplies ATMs with cash, knowing that some of these banks are usurious?

It is impermissible to deal with usurious banks in a way that aids them in their prohibited activities, because doing so constitutes assisting in disobedience to Allah.

Among the forbidden forms of assistance are replenishing usurious banks' ATMs, installing them, and similar actions.

It is permissible to work for companies that replenish ATMs for both usurious and non-usurious banks, provided that the work is exclusively in permissible areas and does not involve direct engagement in or assistance with prohibited acts.