I’m not David but in the same situation before and there are from my experience two important parts: 1) having a good relationship and 2) setting clear boundari

I’m not David but in the same situation before and there are from my experience two important parts: 1) having a good relationship and 2) setting clear boundaries. It’s not a given that it will work out but good faith negotiations are an important start. It will be close to impossible in a mega corp with strict rules. For instance doing this at Apple is from what I have heard effectively impossible. On the other hand I know folks who left to a smaller startup and they took that job under the precondition that they can bootstrap their side hustle alongside.