Ask HN: Resources/services for just the hiring process

It's clear that the level of sophistication in recruitment, screening, and hiring in the tech world has reached new heights in the past decade. This has left me, and I assume many of us with a lot of absurd hurdles to jump to ever have a chance. It is, for me, a total black-box: I fail again and again, without any feedback of how to change. All I can do is try something slightly different the next time, with a new application/company, and see if I can tell anything from the changed variables.

While the problems with tech bootcamps need not be restated here, as an observer from the outside, I am always attracted to, specifically, the components of them that deal with actually forming a resume, getting recruiters, doing interviews, creating a portfolio, etc.

Is there a service that exists which can train people to apply to jobs? I just want someone human I can talk to, that knows the business, and can give me feedback on a given application, help me understand what I am missing.