CI/CD for a Team With a Monorepo of Microservices

Fifty services in one repo means a one-service change should not rebuild and redeploy all fifty.

A microservice monorepo combines monorepo scoping problems with per-service build and deploy fan-out. Affected-only builds and parallelism are essential.

Build only changed services

Use change detection so only the services touched by a PR build, test, and deploy - not the entire fleet.

Fan out across runners

Build affected services in parallel across a matrix; warm pools start them all at once without queueing.

Independent deploys

Each service deploys on its own. Self-healing retries transient registry/deploy failures so one flaky service does not block the batch.

Cost stays flat

Scoped, parallel builds on managed runners at about 69 percent lower cost keep the bill flat as you add services.

Key takeaways

Build only affected services.
Fan out with warm pools; auto-retry deploys.
About 69 percent cheaper keeps cost flat as services grow.

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