This was the industry standard process.
The interview went as expected and will be fair and reasonable if you prepare.
I recommend doing LeetCodes, as others before have said.
The interview asks industry-standard material.
The following metrics were computed from 1,861 interview experiences for the Meta Software Engineer role in United States.
Meta's interview process for their Software Engineer roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Meta's Software Engineer interview process in United States.