first, you’re talking about software “engineers” which means you aren’t talking about engineers in general.
and there’s a good chance none of them have ever had an engineering course in their life. they’re hackers who are good at making code.
the reason they probably seem reluctant to share is that what they’ve cobbled together with bubble gum and bailing wire is difficult to explain quickly and thoroughly AND they’d be taking time away from their assigned tasks to do so without having any change to their deadlines.
stop blaming them and start blaming their management for not giving them the time and permission they need to help you. go to the management and say you need so-and-so to be assigned 40 or 80 hours specifically to help you understand these widgets.
and in the future you need to push for clean up, documentation, lessons learned, and training to be part of every project estimate.
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