You can trust in basic programmer competence when there is a certification the programmer has to loose if he displays incompetence, like done for other engineer

You can trust in basic programmer competence when there is a certification the programmer has to loose if he displays incompetence, like done for other engineers and also doctors and lawyers and many more. Until then, you have to make the financial incentives in the short and long term such that they lead to desirable behavior, e.g., producing non-barfing middleware in this case.