I encountered one corporation where you walked up to security, told them you were there to look for work, and they directed you to an office that contained posting of currently available positions. As far as I know, they didn't advertise job openings anywhere else. If you weren't willing to drop by their offices, they weren't interested in considering you.

Of course, talking to anyone about a job within the building was an entirely different matter.

> This but after going inside the building without authorization

That would make you eminently qualified for a position in AI these days.