anecdotally, i know more people that struggle with the hiring process then these extroverted super connected senior developers that just hop job from job that apparently exist. from the group of people i keep in contact with, i think only one is doing something like that. also the people we hired went through application pipelines and weren't just showing up after being recommended
I know quite a few developers who have a knack for following market trends and jumping on the rocket ship before it is about to launch.
It's actually not that hard if you think about what filter you would apply. The one hard part is finding recruiters who specialize in placing people at these companies, and, of course, passing the interview (or at least enough success that the interviewer doesn't tell the recruiter you are a poor quality candidate).