There were 3 rounds with technical challenges and also behavioral. The interviewers want to see your understanding of data structure and algorithms as well as your ability to think through the problem.
I applied through a recruiter. The process took 3 months. I interviewed at Meta in Nov 2024
Interview
Recruited reached out. Online OA and behavioral assesment. Got scheduled for Superday after (2 45-min technical interviews (leetcoode style) + 1 45-min behavioral interview). They wanted a technical follow-up after the superday which was another 45-min leetcode style interview
Super Day style - 2 technical interviews and 1 behavioural interview with an engineering manager. The technical questions were leetcode style usually tagged. Behavioural was just multiple questions and provide it in STAR format