It was a slow, tedious, and not well-thought-out process. Everything you've heard, on both ends of the spectrum, is true about them, but they deviate towards the no-bueno end of the spectrum. And they ghost you, or take so long to reject you that you have found another job or moved on.
They ask about your history and background. They do a deeper dive into your technical expertise and ensure you understand the tradeoffs between approaches, LeetCode questions, etc.
The following metrics were computed from 2,519 interview experiences for the Meta Software Engineer role.
Meta's interview process for their Software Engineer roles is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Meta's Software Engineer interview process.