Andrew Bialecki is the cofounder and co-CEO of Klaviyo, the B2C CRM that helps brands understand who their customers actually are – so every interaction feels personal. Nearly 200,000 consumer brands, from Mattel and Glossier to Liquid Death, use Klaviyo to build real relationships with their customers. Andrew started Klaviyo back in 2012 after working in engineering roles across several marketing and analytics startups, and he still approaches the company like a builder—he still writes code. Before all this, he studied physics and astrophysics at Harvard, which makes a lot of sense when you hear how he thinks about systems, data, and scale. He leads one of the few public software companies growing over 30% at a billion-dollar run rate, intent on pushing the industry into the next era of agentic, AI-driven commerce.