Monorepo vs Polyrepo: how should you organize your code?

As a company accumulates projects, libraries, and services, an organizational question emerges: do we keep all of our code in a single repository (monorepo), or each project in its own (polyrepo)? It can look like a minor technical detail, but the decision affects how teams collaborate, how code is shared, how things are deployed, and how consistency is maintained. There is no universal answer; each strategy has clear advantages depending on the size of the organization and the nature of the projects.

In this article we compare the monorepo and the polyrepo, their pros and cons, and explain how to choose based on your situation.

What a monorepo is

A monorepo is a single repository that holds the code for many projects, services, or libraries at once. Its great advantage is consistency and ease of sharing: all the code lives together, it is easy to reuse common libraries, to make a change that affects several projects at the same time, and to keep versions and tooling unified. Many large tech companies use it. In exchange, it requires the right tools to manage its size, and without them the repository can become slow and hard to handle at large scale.

What a polyrepo is

The polyrepo (or multirepo) approach keeps each project in its own independent repository. Its great advantage is autonomy and simplicity: each team manages its repo with complete freedom, permissions and deployments are cleanly separated, and every repository is small and easy to understand. It is the most traditional and natural approach. In exchange, sharing code between projects is more complicated, keeping everything consistent takes more effort, and a change that affects several repos requires coordinating several separate changes.

The key differences

These are the factors where the difference between a monorepo and a polyrepo shows up the most:

• Sharing code: easy in a monorepo; more costly in a polyrepo.
• Consistency: unified in a monorepo; scattered in a polyrepo.
• Team autonomy: greater in a polyrepo.
• Cross-cutting changes: straightforward in a monorepo; coordinated in a polyrepo.
• Size and tooling: a monorepo demands tooling in order to scale.
• Isolation: clearer in a polyrepo (permissions, deployments).

The coordination factor

The underlying difference comes down to coordination. A monorepo makes changes that cross several projects easier: a modification to a shared library is applied and tested against everything that uses it in a single step, which avoids version incompatibilities. A polyrepo, on the other hand, isolates each project, which grants independence but hands the teams the job of coordinating versions and propagating changes. The choice depends heavily on how closely your projects are related to one another.

The role of tooling

A significant part of the debate has shifted to tooling. Historically, the monorepo was associated with repositories that became slow and unwieldy as they grew, which pushed many teams toward the polyrepo. Today there are dedicated monorepo management tools that solve much of that problem: they build and test only what has changed, manage internal dependencies, and maintain performance even with hundreds of projects inside. This has made the monorepo far more viable for mid-sized organizations, not just for the large tech companies. Even so, those tools add their own complexity and learning curve, so adopting a monorepo without the right tooling usually goes badly. The decision, therefore, is not only one of strategy, but also of whether the team is willing to invest in the tools that make it sustainable.

How to choose

Choose a monorepo when your projects share a lot of code, when you value consistency and cross-cutting changes, or when you want a unified development experience, provided you adopt the right tools to manage it. Choose a polyrepo when your projects are independent, when teams need full autonomy, or for simplicity when there is not much shared code. There is no universally better option: the right decision depends on the size of your organization and how tightly your projects are intertwined.

At AxiomTech we organize code with the strategy that fits each team and project, monorepo or polyrepo, with the tools that make it efficient. If your codebase has grown and you are unsure how to organize it, let's talk and we will advise you based on your situation.