Google has the geolocation of every software developer in the world.
They know where that developer came from and where they now reside.
They know which company that developer works for.
And almost all past companies that developer worked for.
And how long the developer worked for each company.
They know all of that developer’s colleagues who are also developers.
They also know which colleagues are working on the same project as that developer.
They know that developer’s github projects.
Their OpenSource contributions.
What primary language they speak.
They know what languages they program in.
And what frameworks they use.
The operating systems that are their daily driver.
And the platforms they develop software for.
And what kind of projects they work on.
They know what issues the developer is facing.
And could even chart where the developer is in the SDLC of the project.
With a little bit of analytics they would also know how proficient the developer is in a particular language and framework.
Google wouldn’t even need to conduct a technical interview.
If Google wanted to, they could target key software developer individuals in any organization right there in the SERPs.
And you, as their manager, wouldn’t even know it.