Klaviyo Requires Every Employee — Including Summer Interns — to Hit 'L3' Agent Autonomy

Klaviyo co-founder and co-CEO Andrew Bialecki gave the AI-in-sales crowd a number most of them don’t have an answer for yet: every employee at his company — including product managers, designers, sales, marketing, and summer interns — had to reach “L3” AI autonomy by the end of June. Klaviyo’s internal scale runs like self-driving car levels: L1 is using AI to search, L2 is running a single agent session, L3 is running multiple concurrent agent sessions or a team of agents. Everyone at the company commits code now, whatever their title says.

The business context makes the mandate less abstract. Klaviyo posted $370.6M in Q2 2026 revenue, up 26%, with full-year guidance raised to $1.526–$1.534B and more than 205,000 customers. Composer, its new marketing agent, crossed 95,000 users in its first month, with roughly a quarter returning weekly and credit consumption growing 30% week over week — and the first working prototype was reportedly built over a single weekend by other agents.

The infrastructure behind that speed is what Bialecki calls Dark Factory: a system that takes a prompt, acts as its own project manager, writes specs, decomposes work into engineering subsystems with contractual API interfaces between them, and runs subagents against each piece — pausing to ask clarifying questions when requirements are ambiguous rather than guessing. Composer itself is tuned on live engagement and revenue signal from across Klaviyo’s network, scored by a dedicated coach agent before any proposal ships.

It’s the same instinct Anthropic, Atlassian, and Scale Venture Partners converged on independently at the same conference: build the agent layer on the stack you already run, not a replacement for it. Anthropic’s own numbers back the pattern — threading Claude through existing tools like Salesforce and Slack rather than swapping them out pushed self-serve enterprise adoption to 54% of new logos and returned 70% of AE time from admin work to actual customer engagement. Klaviyo’s L3 mandate is what that pattern looks like when a company decides “self-serve” starts with its own org chart.