Andrew Bialecki

Andrew Bialecki is best known as the co-founder and CEO of Klaviyo, the data-driven marketing automation platform he built into one of the most influential tools in e-commerce marketing. Founded in 2012 alongside co-founder Ed Hallen, Klaviyo transformed how direct-to-consumer brands leverage first-party customer data for personalized email and SMS campaigns, positioning itself as a powerful alternative to legacy marketing clouds. Klaviyo's September 2023 IPO on the NYSE at a valuation of approximately $9 billion marked one of the most significant AdTech and MarTech public offerings of that year, cementing Bialecki's status as a defining figure in the marketing technology landscape. Bialecki's background is rooted in software engineering and data infrastructure. Before founding Klaviyo, he worked as a software engineer and held roles at companies including Performable, a marketing analytics startup later acquired by HubSpot. This experience gave him deep insight into the gap between raw customer data and actionable marketing intelligence — a gap Klaviyo was explicitly built to close. Under his leadership, Klaviyo grew to serve over 130,000 businesses globally, with particularly deep penetration in the Shopify ecosystem through a landmark partnership that also saw Shopify invest in the company. In the broader AdTech and MarTech ecosystem, Bialecki has been a vocal advocate for first-party data strategies, helping brands reduce dependence on third-party cookies and walled-garden advertising platforms. His platform's emphasis on owned channels — email, SMS, and on-site personalization — has made Klaviyo a central player in conversations around identity resolution, customer data platforms (CDPs), and the future of privacy-compliant marketing. He is widely regarded as an operator-founder who has scaled a technically sophisticated product into a category-defining company.

• CEO

  Klaviyo · From 2012

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