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Poolside — Startup Profile
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Poolside

Jason Warner, who helped incubate GitHub Copilot as GitHub's CTO, met Eiso Kant in 2017 when he tried to buy Kant's AI-for-code startup.

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Founder stories

Poolside: GitHub's Former CTO and the Founder He Once Tried to Acquire Bet That Code Is the Road to AGI, Then Hit the Limits of Compute

Jason Warner, who helped incubate GitHub Copilot as GitHub's CTO, met Eiso Kant in 2017 when he tried to buy Kant's AI-for-code startup. Six years later they founded Poolside to build their own foundation models for software development, trained with reinforcement learning from code execution. Poolside raised a $126 million seed and a $500 million Series B, planned a 2GW data center campus in Texas, and then saw both a CoreWeave partnership and a reported $2 billion round fall apart in 2026.

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About the startup

Jason Warner, who helped incubate GitHub Copilot as GitHub's CTO, met Eiso Kant in 2017 when he tried to buy Kant's AI-for-code startup. Six years later they founded Poolside to build their own foundation models for software development, trained with reinforcement learning from code execution. Poolside raised a $126 million seed and a $500 million Series B, planned a 2GW data center campus in Texas, and then saw both a CoreWeave partnership and a reported $2 billion round fall apart in 2026.

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Poolside: GitHub's Former CTO and the Founder He Once Tried to Acquire Bet That Code Is the Road to AGI, Then Hit the Limits of Compute

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