HR and then two technical interviews, each around an hour. You have to give your best solution, including time and space complexity, and then you need to code it. Usually 10-30 minutes max per question.
First interview: Classic string questions. You can find those questions in InterviewBit.
The following metrics were computed from 1 interview experience for the Meta Software Internship role in Israel.
Meta's interview process for their Software Internship roles in Israel is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Meta's Software Internship interview process in Israel.