NVIDIA interview questions

Applied online and got a call back after few weeks. Both software and hardware questions are asked. Starting from MUX based logic to Palindrome C program. The interview was easy but not sure why they did not select.

Applied online. 2 phone screen rounds. Invited for onsite. 6 technical rounds(45 min each). Interview was focused on C++ concepts, OOPS desgin, multithreading, api design and algorithms. Didn't do well in 2 rounds. The team aren't that friendly either. The manager was even interviewing during the lunch, didn't expect that. The recruiter got back to me in a week with the result.