CI/CD for a Team With a Go Monorepo

A Go monorepo can rebuild and re-test everything on a one-line change unless CI is scoped.

Go compiles fast, but a large monorepo without scoping or caching still rebuilds and re-tests far more than it needs to.

Build only what changed

Use path filters or affected-package detection so untouched modules skip rebuild and re-test.

Cache the Go caches

Cache the Go build cache and module cache so compilation reuses prior output instead of starting cold.

Parallelize packages

Shard test packages across a matrix so the suite finishes in parallel rather than one long serial run.

Keep cost linear

Scoped, cached builds on managed runners at about 69 percent lower cost keep the bill linear as the monorepo and team grow.

Key takeaways

• Scope builds to affected modules.
• Cache build and module caches.
• About 69 percent cheaper keeps cost linear at scale.

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