Databases and Database Related

 Whatever my title or role, I have almost always been the domain architect or database guy or DBA on every project I have worked on for the past 10 years.
 
I'm always happy to delegate as much of the authority and or work to whoever it fits best with, but design issues at the domain model level almost always get decided at my desk last.  
 
Hierarchical data structures can take many forms, including but not limited to databases. Linked below, I cover some of the particulars of my experience in this area.