First a quick call with their recruiter, who also asked some basic C++ questions. After that 1h with their senior engineer, talking about my past projects and bunch of C++ questions. Then I got sent a multithreaded take home exercise. Lastly had a call with 2 engineers with whom I went over my take home. Then long wait with no reply, only to be told they went with another candidate. In general the questions were easy, all of them about C++ knowledge. Take home was also easy. There were no algorithm/leetcode style questions.