Why (Senior) Engineers Struggle to Build AI Agents

I don't know why you would say juniors handle this better. From what I've seen, juniors who ship fast often do so by ignoring domain complexity and testing against a single "happy path" prompt.

Seniors take longer because they are actually trying to understand the domain and cover edge cases. Speed isn't a metric of success if the feature is half-baked and breaks the moment a user deviates from the test case.

Juniors are juniors because they haven't yet struggled with mistakes of their own creation. In a few years we should see some pretty strong senior engineers emerging.