I used to write tests for a cryptocurrency trading platform. I regularly talked to the auditors, as they were the ones who made sure that the crypto we transferred into external wallets made it back into internal wallets after the test.

I wouldn't say that I knew a bunch of accounting practices from talking to them, but I _did_ learn that the CTO and director of QA both lied to me during my interview. Sure, we made _some_ money from the spread as claimed in my interview, but in truth, the bulk of our money came from loaning our customer deposits to 3 Arrows Capital. I knew we were fucked _months_ before the company suddenly went under.