I personally wouldn't share code written for anyone other than myself as part of a hiring process. However, my understanding is that it is very common for code

I personally wouldn't share code written for anyone other than myself as part of a hiring process. However, my understanding is that it is very common for code samples from current or former employers to be shared in interviews. There's an unsaid understanding that it is not technically allowed, but I've also yet to hear that it has interfered with a potential hire. I don't have a lot of data points on this, so if anyone else with experience doing hiring at SV unicorns can chime in, I am curious.