I received an OA including three coding problems and 17 multiple choices problems including basic knowledge of C++. The questions are quite hard and the time limit is quite short. I didn't pass all the testcases of the last question.

They ask difficult questions but, given the role they seemed fair. They are painfully slow about the process and I wasn't able to attend the final round interview due to a job deadline I had informed them about, which I had to commit to since they did not reach back soon enough. Later they informed me they'd like to continue but it was too late lol.