Google keeps billions of lines of code in a single repository. Netflix splits theirs into thousands of repositories. Both approaches work. The question is which works better for your team.
Definitions
Monorepo: One repository containing multiple projects, packages, and services. Shared code lives alongside the applications that consume it.
Polyrepo: Each project, package, or service lives in its own repository. Shared code is published as packages (npm, pip, etc.) and consumed via package managers.
Monorepo Tools in 2026
| Tool | Focus | Speed |
|---|---|---|
| Turborepo | JavaScript/TypeScript | Fast (caching) |
| Nx | JavaScript/TypeScript | Fast (computation caching) |
| pnpm workspaces | JavaScript | Package management |
| Bazel | Any language | Very fast (Google-scale) |
| Pants | Python/Go/Java | Fast (fine-grained) |
| Moon | Any language | Fast (Rust-based) |
Feature Comparison
| Feature | Monorepo | Polyrepo |
|---|---|---|
| Code sharing | Trivial (import directly) | Requires publishing packages |
| Atomic changes | Yes (one commit across projects) | No (multi-repo PRs needed) |
| Dependency management | Unified versions | Independent versions |
| CI/CD complexity | Higher (needs smart filtering) | Lower (per-repo pipelines) |
| Repository size | Grows large over time | Stays small per repo |
| Team autonomy | Less (shared standards) | More (independent processes) |
| Onboarding | One clone (may be slow) | Clone only what you need |
| Refactoring | Easier (grep/replace everywhere) | Harder (cross-repo changes) |
When Monorepo Wins
Shared Component Library
Your frontend team builds reusable components consumed by 5 applications. In a monorepo:
- Change a Button component and instantly see the impact across all 5 apps
- Run tests for all consumers in one CI pipeline
- No package publishing/versioning overhead
- Refactor confidently with global search and replace
In a polyrepo:
- Publish the component library as a package
- Each app pins a version and upgrades independently
- Breaking changes require coordinating 5 separate upgrades
- Testing the integration requires manual effort
Shared Backend Logic
Your API and worker service share database models and validation logic. In a monorepo, they import from a shared package directly. Changes propagate instantly.
Startup or Small Team (2-10 developers)
The overhead of managing multiple repositories, package versioning, and cross-repo tooling is not justified for small teams. A monorepo keeps everything simple.
When Polyrepo Wins
Independent Deployment Cadence
Your marketing site ships 10 times per day. Your core API ships once per week after manual QA. Coupling them in a monorepo creates unnecessary coordination.
Different Tech Stacks
Your frontend is Next.js, your backend is Python, and your data pipeline is Spark. A polyrepo lets each team use their preferred tools without interference.
Large Organization (50+ developers)
When dozens of teams touch the same repository:
- CI pipelines become slow and complex
- Merge conflicts increase
- One broken test blocks everyone
- Repository clone time grows
Open Source Projects
Open source consumers expect standalone repositories they can install via a package manager.
Cost Analysis
Monorepo Costs
| Item | Cost |
|---|---|
| Tooling setup (Turborepo/Nx) | 2-4 hours |
| CI configuration (filtered builds) | 1-2 days |
| Repository growth management | Ongoing |
| All-or-nothing build risk | Medium |
Polyrepo Costs
| Item | Cost |
|---|---|
| Package publishing pipeline | 1-2 days per package |
| Cross-repo change coordination | Ongoing (high) |
| Dependency version management | Ongoing |
| Duplicated CI/CD configuration | Medium |
Our Setup
We use a monorepo with Turborepo and pnpm workspaces for most client projects. The typical structure:
apps/
web/ # Next.js frontend
api/ # Backend API
packages/
ui/ # Shared components
db/ # Database schema and client
config/ # Shared configuration
types/ # Shared TypeScript types
This gives us atomic deployments, shared code without publishing overhead, and consistent tooling across the entire project.
Our Recommendation
| Team Size | Recommendation |
|---|---|
| 1-10 developers | Monorepo |
| 10-30 developers | Monorepo with strong tooling |
| 30-50 developers | Evaluate both (depends on team structure) |
| 50+ developers | Polyrepo or modular monorepo |
Start with a monorepo. Split into polyrepo only when the coordination cost of a monorepo exceeds the coordination cost of multiple repositories.
Contact us to discuss your project architecture.