To get the interview, you just gotta have some years of experience, some side projects, and that's about it. If you went to a top tier school or something like that, you don't even need the years of experience. Getting an interview at those companies is the easy part, pretty much everyone I went to college with got an interview with one of those companies before graduating (and I didn't go to some super known ivy league college, it was just a pretty good public school in Georgia). The issue was that most people didn't pass those interviews.

To pass the interview, read up on systems design, read up on algorithms, practice some leetcode/hackerrank/etc., and you are good to go. All of those resources can be easily obtained for free. There is no secret or trick to any of that.