Syntonic Software Engineer interview questions

First interview was some thread management challenges in C++. It toke 90min for answering all those details. Second round was with two interviewers. They went deep to c++ questions about multi-threading and bitwise operations in C. From the beginning, main interviewer was sleeping in live session! It was a very unprofessional behavior at 11AM! It got me thinking this position is not serious and they are not looking for someone serious. Third interview was with their customer. While i answered all those questions properly and and they confirmed this, they did not update the status of my application even after two months! totally, a very bad experience, and recommend everyone not to apply for this company.