I agree with the comments here. Join the startup if you believe in the 'team' and the problem they are solving. Look at the teams track record, is this their f

I agree with the comments here. Join the startup if you believe in the 'team' and the problem they are solving. Look at the teams track record, is this their first startup? What experience do they have? How committed are they? What do they require from you? Do they have a clear way to acquire customers? Are you dealing with a chicken egg problem? Do they have a clear goal to monetize their site? How long have they spent on validation? Have they found customers that would pay for their service before launching it? What's the time frame, as in, how long do they expect you to be working on this project? I read an article, I think it might of been on Sam Altman's site, that said, you need a leader, a manager and a techie. Each having very distinctively roles to play. Having a reputable investor is a good sign, but doesn't mean it's going to work. It all comes down to the team executing it. Focus on skill set of the team, rather than the investors big name. Do some background checks on the Founders, if anything seems fishy, get out of there. On the other hand, if it looks like you have found an awesome team - sign yourself up. I'm on my second startup now, it's a side project. I'm interviewing people for my team. I got hustler from Rutgers, who went out and got the sign ups for a social network, she has connections to TechStars and Y Combinator. Her previously startup, she was working with a growth hacker (which is what I do). So we are a good match. Have 5 interviews with programmers over the next two weeks, and I've found people that will help out with marketing and programming for free. I focussed on 'specific sets of skills' I want my team to have. Best of luck!