NVIDIA interview questions

I interviewed with Nvidia for a Backend Compiler Engineer position after attending their campus day, where I spent 4 hours networking and expressing interest in compiler roles to recruiters. The first round was with a senior manager. We started with topological sort coding question naturally evolved into an engaging conversation about its applications in automatic differentiation and dataflow analysis. The interview ended up to be predominantly theoretical without actual coding, but the technical discussion was deep. In the second round, despite some difficulties due to accents, we covered pointer analysis, dependence analysis, and architectural considerations behind compiler optimizations. I received a rejection email very early the next morning,

zoom meeting with 2 interviewers - they had a PowerPoint of questions and chose from there. asked one riddle gave some code in C and asked what was wrong with it... and some coding code in leetcode style