Is it permissible to work in a bank as a security guard or a cleaner or a driver?

Answer

A bank is a haraam entity. It is primarily the worst institution of riba. Riba, is worse than zina said our Nabi (Sallallahu alayhi wasallam). The services of a bank may be used to only the degree of need. Working as a security guard or cleaner, etc. for a bank is not permissible. It is I'aanat alal ma'siyat (aiding in sin). Just as it is not permissible to work for a liquor store or for a brothel in any capacity whatsoever, so too is it not permissible working for a bank.