ANSWER:
This is totally prohibited and the income is haram because Allah ordered us in the Quran not to assist each other in evil and sins! And Allah has waged a war against people who deal with riba!
https://islamqa.info/en/answers/112175/ruling-on-working-as-an-accountant-in-companies-institutions-and-factories
https://islamqa.info/en/answers/103181/ruling-on-studying-accountancy-and-working-as-an-accountant-in-various-companies-and-organizations