There were three rounds:
Questions were taken from practice problems. This was pre-layoffs, though, so it has probably changed.
The eight queens problem, then another one from the practice.
The following metrics were computed from 105 interview experiences for the Meta SWE Intern role in United States.
Meta's interview process for their SWE Intern roles in the United States is very selective, failing most engineers who go through it.
Candidates reported having very good feelings for Meta's SWE Intern interview process in United States.