How Ephemeral PR Environments Caught 12 Breaking API Changes Before Production

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A development team discovered their shared staging environment was unreliable after a critical API change passed integration tests but broke their mobile app in production. To fix this, they built ephemeral, per-pull-request staging environments using GitHub Actions, isolated AWS RDS instances, and automated contract testing via Pact and OpenAPI validation. Each environment is automatically destroyed after two hours by an AWS Lambda function, keeping monthly infrastructure costs around $300 compared to $500 for their previous always-on shared setup. Over three months, the new system caught 12 breaking API changes before they reached production, eliminating costly outages that had previously cost over $10,000 each. The team credits the improvement to combining consumer-driven contract testing with automated environment lifecycle management, and recommends the approach for teams running multiple interdependent services.

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