How Ramp built a full context background coding agent on Modal | Modal Blog

What this post added

This post details how Ramp leveraged Modal Sandboxes to build a full-context background coding agent. It highlights the use of filesystem snapshots for near-instant sandbox startup times (under 30 minutes from the last snapshot), the integration of multiple services (Postgres, Redis, Temporal, RabbitMQ, VS Code server, VNC stack with Chromium) within a single sandbox to replicate local development environments, and the use of Modal's distributed primitives (Functions for cron jobs, Dicts for coordination, Queues for routing) to manage hundreds of concurrent sessions. The agent's ability to integrate with Ramp's observability stack (Sentry, Datadog) and CI/CD tools (GitHub, Buildkite) for end-to-end verification is also emphasized.