Understanding the system and understanding the code is different. The “system” I just mentioned was “architected” by me just like I would have done in 2018 when I first started with AWS (but with 20 years of experience with coding).

I know what every module does (well Lambda in my case but I’m trying to be more generic), I know the abstractions, I know the business case, etc.

As a team lead/architect, even with other people writing code, I don’t know every line of code does. Claude code/Codex is just a junior/mid level developer to me