I applied through another source.
First rounds: asked questions related to search and sorting. All LeetCode-style questions. The interviewer was friendly. There was a binary search related question. There was another question that I don't remember, to be honest.
The following metrics were computed from 256 interview experiences for the Meta Senior Software Engineer role.
Meta's interview process for their Senior Software Engineer roles is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Meta's Senior Software Engineer interview process.