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Sandboxmaxxing at Lovable: Every Prompt Gets a Sandbox in < 1s

Every Lovable prompt spins up a sandboxed dev environment, and at 50M+ apps, provisioning time and stability become the P99 that defines the product. We’ll cover a year of squeezing latency, cost, and failure out of that path: from third-party sandboxes to a Cloudflare Durable Objects scheduler to our current setup—ten GKE clusters, pre-warmed pod allocation via single JSON PATCH, Envoy/xDS routing—including the outages, ReplicaSet internals that stall refills, and validation at 120k pods and 150 pods/s with sub-second, zero-failure acquisition.

18 minutes
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Adrien Delorme, Member Of Technical Staff at Lovable

Adrien works on sandbox infra at Lovable in Stockholm. Before that, infra at Hugging Face. Before that, Packer at HashiCorp, back when the templates were JSON. He made containerd pull images much faster. Somewhere somebody is watching a spinner, waiting for a sandbox to come up. He believes that spinner should never be seen.

Jonathan Grahl, Team Lead, Infrastructure at Lovable

Jonathan Grahl is an engineer at Lovable, where he works on their production infrastructure. He joined through Lovable's acquisition of Molnett, the European cloud provider he founded. Previously, he built game infrastructure at Embark Studios (ARC Raiders) and worked on the team that built Candy Crush's private cloud.