Agent Sandbox with Lovable, with Jonathan Grahl

Scaling Kubernetes for high-churn, stateful sandbox environments requires unconventional infrastructure strategies to support hundreds of thousands of daily project builds. Lovable, a platform designed to assist non-technical users in building SaaS products, manages these workloads by bypassing standard deployment controllers in favor of "warm pooling." By manipulating Kubernetes primitives—specifically removing owner references and selectors—the system maintains pod availability while optimizing for rapid creation rates. The team utilizes gVisor for secure process isolation, enabling effective memory reclamation despite performance overheads in file system operations. As the platform scales, the infrastructure must evolve to handle massive horizontal growth and ephemeral database isolation, often pushing the limits of current Kubernetes controllers. Jonathan Grahl, Infrastructure Lead at Lovable, highlights these technical challenges, emphasizing the necessity of balancing performance, cost, and security in ephemeral, stateful environments.