Appears that the author got some help organizing the document, but wrote it all themselves.

Hey, author here :)

Its at least 80% organic artisanal writing and maybe 20% AI when I needed help with grammar, completeness, broader perspective and everything around.

I worked for a few years in consumer banking, and this looks like solid advice.

Whilst I wouldn't say anything in it requires years of experience to know, this would be helpful for someone who hasn't considered anything about monetary systems. It doesn't read like slop, but I could be wrong but even so it all seems fairly reasonable (I've only fully read about 50% before realising there's nothing new here for me, and then skimmed to rest).

Skimmed it and based on my experience in fintech, it looks good, accurately represents the real world. I guess there’s still a chance it is AI generated but it doesn’t seem like vacuous slop, it has substance!

from the author's mastodon post [0]

    I just published Fintech Engineering Handbook distilled from 6 years of tears, sweat and swears. 
    It’s a free ~25-page resource with various hints and patterns around handling money. 
    Tell me what you think!

[0]: https://mas.to/@krever/116814803588993437

[1]: https://github.com/Krever/fintech-engineering-handbook/commi...