Monorepo vs Polyrepo: How to Choose (Pros, Cons & Data)

The debate between monorepo and polyrepo architectures focuses on choosing the right repository structure for software development, with both models offering distinct advantages and challenges. Monorepos, exemplified by Google's use of a single repository for billions of lines of code, allow for atomic changes and easy code sharing but require significant investment in build infrastructure to manage scale and complexity. Conversely, polyrepos, favored by companies like Amazon and Netflix, provide team autonomy and fine-grained access control but can lead to discoverability issues and challenges with cross-repo changes. The decision often hinges on team size, change patterns, and tooling budget, with the key takeaway being the importance of investing in the appropriate tooling to support the chosen architecture. Both approaches can be effective if the necessary infrastructure investments are made to mitigate their respective downsides.

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