Courtesy of Klaviyo
This as-told-to essay is based on a conversation with Andrew Bialecki, the 40-year-old CEO of Klaviyo, based in Boston. It's been edited for length and clarity.
I got a BA in physics, astronomy, and astrophysics from Harvard. While in college, I interned at a small division of Microsoft that managed the MSN.com website.
After graduating in 2007, I worked at several


