As a college student, Peter Reinhardt (@reinpk) started a company that stumbled, pivoted, and nearly ran out of money before a small open-source library became Segment—the data layer behind thousands of software companies and was later acquired by Twilio. On the Social Radars with @jesslivingston and @cjoneslevy, he reflects on the panic attacks, pricing mistakes, and how he learned to sell by listening hard to customers. Lessons he now carries into Charm Industrial, where he’s working to…