Ask HN: Startup for a day in SFO?

Visiting San Francisco for the first time. I am 24 do product design and code, and I'd love to join any kind of startup for one day. I know no one there so I had this idea to ask here. Who's inviting me? I want to help for a day.

My skills: React, React Native, Objc , Swift, Rails, Node, GraphQL (apollo). Art: Product design, UX, Sketch, After Effects.

Love!