Poolside

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Poolside is a full stack platform for enterprise software development, combining its own foundation models, developer tools, and a governed agent orchestration layer that runs entirely inside the customer's infrastructure. Founded in 2023 by Jason Warner, the former chief technology officer of GitHub, and Eiso Kant, the company trains its models with Reinforcement Learning from Code Execution Feedback, learning from actually running code rather than only reading it. Its flagship model Malibu handles code generation, refactoring, and test writing, while a smaller model, Point, drives low latency completion. Both can be fine tuned on a customer's own codebase, documentation, and knowledge bases. On top of the models sits an agent platform. Through the Poolside Console, teams build and govern single and multi agent systems that run in isolated sandboxes, with an example agent taking a natural language specification, generating a working pipeline, pushing it to GitHub, building it through an API, and iterating until every step passes. Pipelines are code first and fully auditable, and meta pipelines review agent trajectories to refine how work gets done. The Console runs Poolside's own models alongside third party models such as Claude and GPT, configured per agent, giving teams real routing flexibility rather than a single fixed model. Poolside's defining choice is sovereignty. Customers receive full model weights, not just API access, and deploy the entire stack into the environment they control, whether a cloud VPC, an on premises rack supporting hundreds of developers, a compact offline workstation for small classified teams, or their own NVIDIA hardware through Helm. Nothing leaves the boundary. The security posture targets demanding buyers: role based access control per agent, sandboxed execution with filesystem and network policies set before an agent starts, centralized secrets injected at runtime and redacted from logs, audit retention with SIEM integration, and government grade options including air gapped operation, a hardened operating system, and IL5 deployability. The company is heavily backed. It raised a 500 million dollar Series B in 2024 led by Bain Capital, DST Global, and eBay at a 3 billion dollar valuation, and in 2025 Nvidia committed to invest up to 1 billion dollars, lifting the valuation toward 12 billion. Roughly 150 people work across the United States, United Kingdom, and France, with early defense customers including RTX Corporation. Poolside sells through Forward Deployed Research Engineers who embed with customer teams to ship agents into production. In early 2026 it released Laguna XS.2, a free open weight model for local agentic coding, alongside preview surfaces including a terminal agent.