Situation
A healthcare startup had 40+ API endpoints serving a mobile app and web dashboard. Breaking changes regularly caused production incidents because there was no contract testing.
Task
Implement contract testing between the API and its consumers, and set up monitoring to catch regressions before production.
Action
We introduced Pact for consumer-driven contract testing, wrote integration tests for all 40+ endpoints, added OpenAPI spec validation to CI, and set up Grafana dashboards for API health monitoring.
Result
API reliability improved from 92% to 99.8%. Breaking changes are now caught in CI before merge. Production incidents from API regressions dropped to zero in the first quarter.
Tools Used
PactNode.jsOpenAPIGrafanaGitHub Actions
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