Initially applied online, but did not hear back after a couple weeks. Asked a friend to submit a referral and I was contacted within 24 hours. I was working up against a deadline, and they were able to set up the phone screen quickly. After the phone screen, I was notified they would like to bring me on-site. The on-site interviews went quickly and smoothly. During one of my interviewers, I had to inform the interviewer twice in a row that I had seen the question before on an interview (which was embarrassing, but we quickly moved on to a question I hadn't seen). After contacting my references, Facebook e-mailed me about 10 days later to let me know they were going to make an offer.

1 code signal online assessment into 2 interviews with 2 leet code medium style questions around a 40 minute time frame as well as 1 behavioural interview with SWEs to gauge culture fit.