Enterprise replicas for APIs your teams cannot afford to mock badly.
Carbon gives platform and QA teams a repeatable way to replace shared sandboxes with stateful local runtimes, governed cloud projects, audit history, SSO, SCIM, and optional self-hosting.
Start with teams that already feel the sandbox tax.
The best early enterprise customers have measurable pain before the first call: slow builds, brittle upstream test accounts, compliance review around test data, or many repos duplicating fixture work.
Teams with slow or flaky third-party integration tests
Platforms that maintain shared Stripe, GitHub, Slack, Twilio, or internal API sandboxes
Regulated engineering orgs that need deterministic test environments and audit export
Developer-experience teams trying to standardize API mocks across many repos
A pilot should prove operational value in two weeks.
Pick one integration-heavy workflow, capture or import the contract, run it in CI, and compare the new run against the baseline the team already tracks.
| Metric | How to measure |
|---|---|
| Upstream calls removed | Measure third-party sandbox calls before and after Carbon in CI. |
| Flake rate reduction | Track integration-test retries and non-code failures over two weeks. |
| p95 test latency | Compare selected workflows against the current sandbox-backed suite. |
| Snapshot restore time | Verify seeded environments reset in milliseconds instead of minutes. |
| Coverage migrated | Count workflows moved from static fixtures or shared sandboxes to Carbon. |
Recommended deployment
For the current codebase, keep the dashboard and marketing on Vercel. Run the API and worker as long-running services when you need hosted async ingestion, with Postgres for durable data and Upstash Redis for queue/job state.
Zero-cost demo path
Vercel for web and dashboard, local API for demos, Upstash Redis free tier for async queues, and Neon free tier for Postgres when you connect the backend.
Production path
Keep Vercel for the Next.js apps, then deploy the Fastify API and worker to a service that supports long-running processes. Use `CARBON_PUBLIC_API_URL` only after that host exists.