We use CodeSandbox for interviews (we have a base project that we fork for each interview). It's pretty good for watching someone code on a Zoom call (the actual pair-programming features like multiple cursors are a little buggy, but we don't need those).

I've also seen some open source projects that use CodeSandbox for their example projects. It's a nice experience for examples that require a server and client (that can't simply use storybook). I can understand the value in that, especially if you can automate it and link it to a Git repo with an examples/ folder.