Not a co-founder, but certainly a web front-end programmer required:

https://news.ycombinator.com/item?id=11634804

Initially a short term paid project, but this has the potential to become a long-term project. It's never going to be a unicorn, though, so if unicorns are all you're interesting in, this isn't for you, except potentially to mark time and add to your portfolio.

But if you're interested in a small, paid project, feel free to contact me to chat about what might be done.