23/07/2026
# # 🚀 Monorepo Explained Like You're Building a Real Product
One of the most common interview questions for Senior Software Engineers and Technical Project Managers is:
> **"What is a Monorepo, and why do companies use it?"**
Most people answer:
> "A monorepo stores multiple projects in one repository."
That's correct…
…but it doesn't explain **why companies like Google, Meta, Microsoft, Uber, Airbnb, and many startups prefer it.**
Here's a practical example.
Imagine you're building an enterprise application with:
📱 React Native Mobile App
🌐 React Web Portal
⚙️ Node.js Backend APIs
🤖 AI Services
📦 Shared UI Components
🔐 Shared Authentication Library
# # # Without a Monorepo
Every project lives in a separate Git repository.
```
mobile-app
web-app
backend-api
admin-panel
shared-ui
shared-utils
```
Now imagine changing the authentication flow.
You need to:
• Update multiple repositories
• Publish shared libraries
• Wait for version updates
• Handle dependency mismatches
• Maintain multiple CI/CD pipelines
This becomes difficult as the company grows.
---
# # With a Monorepo
Everything lives in one repository.
```
company/
apps/
mobile/
web/
admin/
services/
auth/
payment/
notification/
packages/
ui/
utils/
api-client/
```
A shared component changes once...
…and every application immediately uses the latest version.
No publishing.
No version mismatch.
No duplicated code.
---
# # Advantages
✅ Shared code
✅ Easier refactoring
✅ One CI/CD pipeline
✅ Better developer experience
✅ Atomic commits
✅ Easier dependency management
✅ Consistent coding standards
✅ Faster onboarding
---
# # Disadvantages
❌ Larger repository
❌ Initial setup is more complex
❌ Requires build tools like Nx, Turborepo or Bazel
❌ CI/CD must be optimized
❌ Poor configuration can slow builds
---
# # When should you use it?
✔ Enterprise products
✔ Multiple frontend applications
✔ Shared component libraries
✔ Shared APIs
✔ AI platforms
✔ Microservice ecosystems
---
# # When should you NOT use it?
❌ Small applications
❌ MVPs
❌ Single mobile app
❌ Small teams (2–3 developers)
---
# # # Popular Monorepo Tools
• Turborepo
• Nx
• Bazel
• Rush
• pnpm Workspaces
• Yarn Workspaces
---
The best architecture isn't the one with the most buzzwords.
It's the one that reduces complexity for your team.
What do you prefer?
**Monorepo or Multiple Repositories?**
