Answer
(Fatwa: 390/387=M)
(1), (2) In Hadith, those were cursed who involve in interest, and among them is one who writes or records interest accounts. So, if the bank system is based on interest you will not be allowed to work there as accountant. Checking interest-based dealings also is like writing which invites curse and amounts to helping in sin. If leaving this work right now may cause you financial problems then you should not leave it until you find a Halal job (allowed resource of income). Keep on seeking forgiveness from Allah and try your best to find a Halal source of income.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband