A tl/dr version would be 1. Runway - how much runway do they have until they run out of money assuming revenues will not increase (which of course they should)

A tl/dr version would be 1. Runway - how much runway do they have until they run out of money assuming revenues will not increase (which of course they should) 2. Culture - does it seem good? Good gauge - are people there even when they don't have to be. 3. Compensation - does it pay enough to make your comfortable and have upside in stake? If so, raises don't matter as much, make your own raise by adding value to your stake.