I won’t even touch the fact that most infrastructure jobs are only partially funded by the federal government with the remainder funded by local tax or rate payers. The federal government has no interest in cost controls beyond their own money and the residents of State X have no interest in funding more of the infrastructure of State Y than they already do.
The article argues that the real gap is not in people who know how to build things, but in dedicated civil servants who know how to manage those people.
And that is a much more transferrable skill than "how to build this kind of rail tunnel through that kind of soil composition" or whatever.
Read the report the article is about. Milan fills this role for the rest of Italy and somehow figures it out just fine.
Does Milan run all of the EU’s jobs too?
Beyond that, as someone with extensive experience with underground projects and the federal government, the federal government doesn’t pay nearly enough and its benefits lag private industry significantly at this point.
It’s also worth noting that this agency already exists somewhat but spread across departments (FHWA, EPA, etc.). They still outsource to consultants.