No, you will not be sinful unless you have committed something that is haram or neglected something that is mandatory.

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Praise be to Allaah. Your working in this bank is haraam, even if you are in a department which does not deal with riba-based transactions. It is sufficient to note that the “central bank” is the head bank and working in the other departments complements the work of the sections that do deal with riba; […]

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