David OKuniev (@okuiux) founded Typeform, a Barcelona-based company that specializes in beautifully designed online surveys. Apple Inc, Uber, Airbnb, and many other tech companies use it.
Find out more about Typeform at https://www.typeform.com/ and check out their newer product, VideoAsk, at https://www.videoask.com/.
Courtney Sabo is the cofounder of Faros (YC W19), a marketplace for furnished apartments and housemates. Check them out at https://www.gofaros.com/
We have a new website for folks who are interested in sharing stories about their side projects. Check it out at https://sideprojects.net/
Keith Schacht is the co-founder of Mystery.org a YC company that helps create a generation of better thinkers. Check it out https://about.mystery.org/. Keith had also built and exited three technology companies so far and had spent some time at Facebook as a product manager.