I applied through my university and some Facebook engineers came to my campus to hold the interviews. Most applicants were for internships but a couple of us applied for full-time, however only internship positions were offered at the end of the interviews. The interviews were all 1 on 1 using a whiteboard for the problems.

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.