I don't think there really is an example that takes years to get up to speed, because if you can't find someone who has the exact experience, you can find someo

I don't think there really is an example that takes years to get up to speed, because if you can't find someone who has the exact experience, you can find someone in a related field. It took me less than a year from writing my first line of code to working as a software engineer. I bet it would take even less now to be a useful compiler engineer.