Facebook Software Engineer interview: BFS matrix task and unfinished technical loop

After the recruiter step, I had a coding-centered technical round with two questions in about 45 minutes. One required a normal solution followed by an optimization follow-up, which made the round more demanding than I expected. In the next video-conference interview, the interviewer was very communicative and answered questions as they came up. The coding challenge used BFS: I was given a matrix…

Shared by a candidate · reported Jul 2026. Interview formats change; use it as a guide, not a script.