There really isn't any "public" info about tech DDs that I could share. The tech DD world is growing likely crazy so if you have a business and tech mind, you'll likely find companies hiring for roles, even if you don't have specific experience.
These are two books that might help you provide perspective on M&A/PE that you would learn if you got into DD:
https://www.amazon.com/dp/1973918927/?coliid=IOSLH6YRD3CP6&c...
https://www.amazon.com/HBR-Guide-Buying-Small-Business-ebook...
For reference - I've done 250+ DDs myself and my firm has done over 500 over the last 6 years.
Assuming the receiver uses a proper offshore construct to accept the payment, this would go by unnoticed by your DD?
But most interesting: What is your best guess - Your partner says you find “a hand full” from a few hundred - how many of these cases do you miss because the recipients use a not easy traceable proxy entity to collect the payment?
Do you try to uncover such hidden actions, if yes, how?
Also, is there a good reason why someone would not use a offshore proxy/holding?
That's the 'million dollar question', and in some cases substantially more than one million. I think the reason a good number of these people get caught is (1) things like the Panama papers and other leaks like that have made it harder to do this, and have also brought the not insubstantial resources of the authorities to review these constructs and (2) most people never expect that during DD such a thing would be checked.
It's typically quite a surprise when we start asking about the activities of companies that the other party believes are well hidden.
There are some criminal service industry leaks that are public, or have been public, yet it doesn’t appear more than a few individual have the motivation to follow trough in combing them. At least this is true for groups who would publish on their findings.
Also, if you do tech DD - most techies are happy to share details that unknowingly might expose because they tend to be less business savvy. CEO/CFO's on the other hand...
Managed to BS the second team way better after that — and they were eager enough to have a share of the rocket ship at all cost.
Guess they weren‘t too happy losing most if their series B invest.
https://jacquesmattheij.com/due-diligence-survival-guide/
and part II:
https://jacquesmattheij.com/due-diligence-survival-guide-par...
Note that these articles are now about a decade old, I probably should update them to reflect the experience gained since then and changes to the state of the art in tech.