As a junior developer myself I've spent the past 4 months exclusively working on a project that began development right after I on-boarded. Initially a massive team effort, the team was re-organized such that I ended up spending the most time and becoming an expert in the new system.

This has been a tremendous experience since I've clearly shown my technical competency, but with all the depth in one area I've lost the breadth of knowledge of all the components we work on. The article mentions learning the business, and I feel like that's at odds with becoming an expert in one area at least in a short period of time.