William Lepinski

Software Engineering

I've been turning coffee into code for over 20 years (yes, I started when dial-up was still a thing). These days, I'm at HubSpot leading Growth Data initiatives — basically, I help figure out why users do what they do, then build the experiments to make them do it better. I'm that rare engineer who actually enjoys metrics, A/B tests, and product thinking. My superpower? Making data-driven decisions while keeping things human. When I'm not wrangling 30 billion events per month or optimizing TypeScript, I'm probably mentoring someone, debating the perfect system architecture, or convincing my team that yes, we really do need another experiment.