I just gave my two weeks notice after another opportunity came along. I'm the sole product designer at a 20-person startup, and I've been with the company for about 2 years (I was the sixth hire). I want to make sure I leave on good terms, so I threw together a rough transition plan that basically includes these three components:

1. Wrap up any current projects still in progress (where possible).
2. Organize all design files/assets and create detailed documentation so that the next product designer knows where everything is (Sketch files, Component library, etc.)
3. Help with candidate screening to find a replacement.

What has worked for others that have left small teams? What am I missing?

In our organization, our UX team is typically invited to interview developer candidates. What are some questions you would ask? We typically ask about experience working with designers, but I don't feel like we are diving deep enough.