Monorepo vs Multirepo: Repository Strategy Comparison

The monorepo vs multirepo decision affects developer workflow, CI/CD efficiency, and team autonomy. Both approaches have strong advocates and proven implementations.

Monorepo

A monorepo stores all projects, libraries, and services in a single repository. Google, Meta, and Microsoft use monorepos. Single versioning eliminates dependency version conflicts. Shared tooling and standards reduce configuration overhead. Cross-project refactoring is easier. CI/CD requires selective execution to avoid running all tests for every change.

Tools: Bazel, Nx, Turborepo, Rush, Lerna. These tools enable incremental builds, affected project detection, and dependency graph management.

Multirepo

Each project or service has its own repository. Teams have autonomy over their tooling and release cycles. Repository size stays manageable. CI/CD is simpler per repository. Cross-project changes require coordination across repos.

CI/CD Considerations

Monorepos need smart CI/CD to only build changed projects. Multirepos need cross-repo coordination for shared changes. Monorepo CI/CD is harder to configure but more efficient for cross-cutting changes.

Choosing

Start with a monorepo for small to medium teams (under 50 developers). Move to multirepos when team autonomy becomes a bottleneck. Many organizations use a hybrid approach: monorepo for related projects, separate repos for independent teams.