Klaviyo Just Bought a 25-Person AI Team to Build the Marketer Inside Your Email Platform

In 2010, Elias Torres hired a Harvard graduate named Andrew Bialecki as one of the first engineers at his startup Performable. On Tuesday, Bialecki bought Torres’ company. Klaviyo, the email and SMS platform Bialecki co-founded, is acquiring the team and technology of Agency, Torres’ three-year-old AI startup, and installing Torres as chief product officer.

The hire is the story. Klaviyo didn’t buy revenue; terms were undisclosed, and Agency, backed by $32 million from Sequoia, Menlo Ventures, and Felicis, brings a 25-person team. What Klaviyo bought is a leadership bet: the person now running product for the platform behind 205,000 businesses’ customer marketing is a founder who spent three years building autonomous customer-service agents, after eight years as CTO of Drift, the conversational-marketing company that sold to Vista Equity for $1.2 billion.

Bialecki was explicit about the direction with TechCrunch:

“It’s the next Big Tech revolution: agents. Let’s get the band back together, and let’s go build.”

Torres will run Klaviyo’s agent line: Composer, which builds and optimizes marketing campaigns on its own, and Customer Agent, which handles post-sale conversations like returns and order tracking. An agent, in plain terms, is AI that does the task rather than suggesting one; you describe the campaign, it segments the audience, writes the messages, and ships it.

Your email platform is no longer selling you a tool. It’s auditioning to be a member of your team.

Torres said as much in Klaviyo’s announcement, and the data point he named is the one to sit with:

“By joining Klaviyo, I get the other half, an understanding of consumer behavior that nobody else has, and the ability to scale faster.”

The other half. Klaviyo stores more than 9 billion consumer profiles and ingests over 250 trillion data points a quarter. An agent with that memory doesn’t start from a brief; it starts from knowing your customers’ purchase history better than your team does. That’s why the platform, not the brand, is positioned to field the first genuinely autonomous marketer, and why every martech vendor is racing to the same spot. The research firm Futurum Group made the retention logic explicit this week: embedding agents in the platform “raises the switching cost for existing customers.” The agent doubles as a moat.

The timing tells you how central this is. Klaviyo announced the deal the same day as its Q2 earnings: revenue of $370.6 million, up 26% YoY, a nearly $1.5 billion run rate. A company growing 26% doesn’t reorganize product leadership around agents as an experiment. This is the roadmap, presented to Wall Street as such.

For the e-commerce and B2C teams living in Klaviyo, the practical questions arrive before the features do. When Composer builds and sends campaigns, the marketer’s job shifts from making to approving, the verification work we’ve covered across every corner of the field. When Customer Agent answers your customers directly, your brand voice is being performed by software trained on your data but owned by your vendor. And when the platform does more of the work, expect it to charge like a worker; the whole martech category has been inching from seats toward outcome pricing, and agents are the product that completes the argument. The YC cohort selling “fire your agency” was the preview; the incumbent platforms buying agent teams is the feature presentation.

The verdict: watch what a $1.5-billion-run-rate platform just did with its product chair, not what any demo shows. Klaviyo concluded the next marketer it ships won’t be a person, and it hired the person who agrees. If Klaviyo runs your email, block an hour this quarter to run Composer against your own last campaign and decide, before renewal season, which parts of the work you’re keeping.