I applied online.

I learned a lot in These two Interview and it is the most difficult interview I have faced till date, there was a lack of communication for them they didn't told why I not selected for the next round after giving 2 interview first one 2 hours and second one 8 hours, I answered every question and about 90 percent interview was good still got rejected .

After putting so much effort you expect a clear communication.

They Tree of space question which was asked in Hackathon was given again and the interviewer asked mee make it thread safe without using any mutex semaphore, atomic library.