This is brilliant! The role of the senior Engineer isn't to tell you how to balance the tree. You, or anyone you instruct to, can simply ask google that or use

This is brilliant! The role of the senior Engineer isn't to tell you how to balance the tree. You, or anyone you instruct to, can simply ask google that or use a library. Their role is to ask why we need to balance the tree. You very definitely can't ask google that, and that's why you need to hire a senior Engineer.