NVIDIA interview questions

It's a telephone intervew. He first asked some question about my resume. Then he asked some basic concept about operating system. At the end he give me a coding question about bit manipulation.

Two phone interviews followed by an on-site. After two weeks, got a verbal offer and finalized salary. Kept delaying to send an offer letter for about 2 months, later they closed the position and did not send after, stating the company is scrutinizing headcount and have closed the position. This felt like how some flights keep delaying and delaying and then finally the announcement will come in saying the flight got cancelled.