How Ramp built a full context background coding agent on Modal

Ramp built Inspect, an internal background coding agent powered by Modal Sandboxes, to provide engineers, product managers, and designers with fast, zero-setup access to full development environments and AI-assisted coding. Each isolated sandbox includes Ramp’s application services, development tools, browser-based visual testing, and integrations with systems such as GitHub, Slack, Buildkite, Sentry, and Datadog, allowing the agent to implement and verify changes end to end. Modal’s filesystem snapshots, refreshed every 30 minutes, enable new sessions to start within seconds from near-current repository states, while distributed functions, queues, and shared storage support hundreds of concurrent, collaborative sessions across multiple client interfaces. Ramp reports that Inspect now initiates roughly half of merged pull requests in its frontend and backend repositories, with more than 80% of Inspect’s own code written by the agent, and expects scalable parallel agent capacity to become increasingly important as coding models improve.

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