Had a 4 question OA on codesignal. Had an interview which consisted 2 leetcode medium difficulty questions. And had a very basic system design round. Overall took 1 month to interview
There were 4 stages to this interview:
Interview with HR about position and high level discussion
Technical Interview (algorithmic questions)
Interview with Hiring Manager (Behavioural questions)
On-Site Interviews (5 in total - mainly technical interviews)
2 leetcode medium questions, both solvable within 20 min (if your prepared). No tests to run against, just need to write coherent code. Then you have 5 min at the end to ask questions about working at Meta.