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  "markdown": "Co-founder and co-CEO.\n\nAndrew Bialecki co-founded Klaviyo with Ed Hallen and is its co-CEO. The two started the company to help consumer brands use their customer data, and it listed on the New York Stock Exchange in 2023. Both previously worked at Applied Predictive Technologies.\n\n- LinkedIn: https://www.linkedin.com/in/bialecki/\n\n## What Andrew builds\n\n- [Klaviyo API + MCP](https://www.anchorterminal.com/tools/klaviyo.md), graded BB, 71.8/100, in Lifecycle marketing \u0026 customer engagement. Klaviyo is a marketing platform that holds customer profiles and events and sends email, SMS, WhatsApp and push campaigns and flows. Agents reach it through a JSON:API REST API and an official hosted MCP server. Co-founder and co-CEO, researched 2026-10-26.\n\n## Works with\n\n- [Ed Hallen](https://www.anchorterminal.com/people/ed-hallen/), Co-founder and Chief Strategy Officer\n\n## Questions\n\n### Who is Andrew Bialecki?\n\nAndrew Bialecki co-founded Klaviyo with Ed Hallen and is its co-CEO. The two started the company to help consumer brands use their customer data, and it listed on the New York Stock Exchange in 2023. Both previously worked at Applied Predictive Technologies.\n\n### What does Klaviyo, Inc. make?\n\nAnchor Terminal lists Klaviyo API + MCP from Klaviyo, Inc.. Klaviyo is a marketing platform that holds customer profiles and events and sends email, SMS, WhatsApp and push campaigns and flows. Agents reach it through a JSON:API REST API and an official hosted MCP server.\n\n### How are Andrew's tools graded?\n\nKlaviyo API + MCP is graded BB, 71.8 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.\n\n## Sources\n\n- https://www.klaviyo.com/uk/about\n- https://www.linkedin.com/in/bialecki/\n- https://www.linkedin.com/in/edhallen/\n- https://www.klaviyo.com/uk/\n- https://www.klaviyo.com/uk/contact-us\n\nThese are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.\n",
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