EEO rules require that available positions be posted to the public, but in many cases there is no intention to interview outside candidates for these positions. For example let’s say a large company wants to convert a contractor into an employee. That position still has to be posted to the public, but it’s only one of many examples.

In my case I am a government contractor so candidates will not even be considered unless they exceed nearly all points of the job requirements. No exceptions.

Also it used to be all about tech stacks and tool trends. As software employment continues to shrink that is also going away. It’s more about skills and experience on a given platform or family of languages than a tool or framework. The upside to this is that while positions continue to shrink the expectations and salaries appear to be going up proportionally.