SIGShooter
(SIGShooter)
10
I spent 35 years writing financial software until I retired and I can assure you that most programmers are terrible at vetting their programs for bugs. Typically they just check for what they’re coding for and maybe what the users usually do rather than all possible scenarios (which actually is hard to do in some cases).
Naturally I was the exception with perfect and bug-free code 
Of course the Volkswagen scandal wasn’t bad coding or debugging, rather it was intentional fraud.