Applied on Craigslist, got an email 2 days later asking me to come in for a screening test. It had simple programming questions and networking definitions/acronyms. After I finished I talked to someone a bit about the company. Since I finished fast enough I was able to take the next test the same day, which was an odd set of questions you can't really study. I was told to send in my SAT and ACT scores as well as my high school and college transcripts. I was called in a week later for the final interview, and that was someone telling me a lot about the company, and then doing some simple coding exercises.