I don't think there can be a checklist for things to look for, same as there can't be a checklist for a startup that will succeed. You should really base your

I don't think there can be a checklist for things to look for, same as there can't be a checklist for a startup that will succeed. You should really base your decision on your alignment with the mission and fit with the people there. That sounds corny but is probably the best formula for success. Especially if you're an engineer, things that seem ridiculous to you could actually end up getting the traction needed for a successful exit (source: I'm an engineer who has seen lots of things I thought were ridiculous pay off and lots of things I thought were important lead nowhere).