ANSWER:

Working in any department of a conventional bank is totally prohibited. 

Kindly refer to the following link(s):

If someone is working in bank as Assistant Director(being a mechanical engineer)and is not directly involved in Riba and the bank transactions , is it still haram?

Jobs | January 24, 2018 4:12 pm
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Can a muslim be a property agent? In my place, majority of the houses involves Riba. So if the property agent only deals in brokerage between 2 parties but not in the financial matter, is it permissible? Thank You.