Have you checked HN's jobs section? You'd probably get more attention responding to a thread there or maybe posting your own if that's in the rules.

If you pitch in with non-technical founders, be prepared to have them question a lot of your recommendations and decisions. Do you have the patience for that? Be sure to choose wisely... your advice probably won't turn around a couple of clueless suits. You can't run a startup the same way you'd run a big business, and anyone with that in mind isn't going to, on faith, listen to the contrary advice of a hire.

In other words, don't do this as an act of charity for someone you think will fail without you. You're investing your time, so spend wisely. Just a reminder.