[diehunde]

Everyone in the industry knows you need to prepare and study for these coding interviews. The interviewer already did that when applying for the company. Of course, they will be rusty if they try to solve one right there unless they are also actively interviewing somewhere else. Also, what kind of interesting signal is that going to give you? It's much better to ask questions about their feedback processes, how they ship software, team structure, exciting projects, etc. Besides money, those things make people leave or stay at companies. Not if your colleague can solve LC questions at any point in time.