بسم الله الرحمن الرحيم
(Fatwa: 748/748/M=08/1437)
It is unlawful to do a job related to interest based dealing. However in the question mentioned above if you are only assigned to check the records, accounts etc of various companies and you only supervise it as an accountant then it is not haram and unlawful, however it is better to avoid it. Hadhrat Mufti Taqi Usmani Sahib writes:
“In the above mentioned question, the job in account department of the said company seems allowable, if one has to maintain only the account of the company then it shall not be helping in sins and thus shall not be haram, as it is distant help, hence this job seems to be allowable at the time of need, however if avoided then it is better.” (Fatawa Usmani: 3/399).
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband