For YC, it was pretty damn slick, but made possible only because a close-knit bond between companies exists to an extent. I remember being super interested in self driving cars, really wanting to work at Cruise and getting their founders email from a YC Partner at the dinner. I was just out of my freshman year, and extremely nervous about emailing the cruise folks, and some of my coworkers at LeadGenius helped me draft intro emails. They were just really great people. My managers at LeadGenius (YC alums themselves) were the first people I told when I got into the fellowship. There were a lot of signals along the way that the folks involved in YC, from the partners to the founders, were __good__ people. I wanted to be part of that. And still am, and still do.