I received OA after applied with referral. The OA contains 3 rounds, first round is C code debugging and relatively easy. Then the 2nd round contains 2 questions and both can be found on leetcode discussion section. The last round simulates working environment and then ask what would you do under various situations. Then it ask many logic questions and relatively easy to do. If I were to pass the OA, I would only have to pass one round of onsite interview to get offer but I did not receive onsite interview even though I past all test cases in 2nd round. It was new grad position so it might be different for social recruitment.