Infrastructure spending, as commonly understood, should follow growth; it does not create growth in and of itself. New downtown sidewalks and lights do not create growth downtown even if better benches for the homeless; growth is what creates new sidewalks.
The only spending, public or private, that creates growth, creates and sustains wealth, is investment in the maintenance or creation in real assets that have future income streams.
Infrastructure spending on real assets (think Tappanzee Bridge) creates wealth directly, in that you get a bridge that can handle an increased volume of tolls. To the degree that such infrastructure spending lowers the cost of production (think expanded labor market through lower commute time, improved transportation creating more reliable deliveries).
Other such investment in airports, ports, electric grid, power plants, etc. can produce positive context for production and creation of real assets, but infrastructure, even focused on creation of future income streams of itself, cannot be successful unless there is a context for growth apart from the individual project.
How does this get you a better job. Effect is indirect, unless you live next to such a project and you work in the trades demanded by that project development. Indirect effect shows up in demand for labor and services that is produced by growth in real assets that you may be able to take advantage of if you have skills in demand and have initiative. Your context for a better job improves but you still have to reach out and qualify for it, same as in a no-growth economy, or declining economy...
You have to ask the personal question; do you want to go fishing at the pond close by, or where the fish are? Are there fish anywhere? Do you want to use the same bait that has caught no fish or do you want fresh bait? If there are no fish, then why use bait?
Infrastructure spending as applied is mostly a Keynesian waste as politics considers all spending the same; its benefit possibility is as above.
Better to reform taxes to encourage domestic investment in real assets; that would drive infrastructure investment anyway.