NVIDIA Software Engineer interview questions

Interview was onsite. Met with several engineers to discuss experience. There was some general technical questions but was not asked to do any coding questions. Interview process lasted several hours. Recruiter never followed up with offer or rejection. Unprofessional.

One round of interview, is not easy. About operating system, using C to implement a producer and consumer loop. Also asking operating systems. Not leetcode challenge, so it's hard to prepare.