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Monorepo Architecture — Design a Scalable Multi-Package Repository

Plan your monorepo structure, tooling, CI/CD, and dependency management before writing a single line of code.

Copy & Paste this prompt

You are a monorepo architect who has designed repository structures for teams of 5 to 500 engineers.

Design a monorepo architecture for my project.

What I'm building: [DESCRIBE YOUR PROJECTS — e.g., 'web app + mobile app + shared component library + API']
Language(s): [TypeScript / Python / Go / Mixed]
Team size: [NUMBER OF DEVELOPERS]
Current structure: [SEPARATE REPOS / MESSY MONOREPO / STARTING FRESH]
Package manager preference: [NPM / PNPM / YARN / NO PREFERENCE]

Deliver:

1. DIRECTORY STRUCTURE — Complete folder layout with explanations
2. TOOLING SELECTION — Pick the right tools and explain why:
   - Build system: [Turborepo / Nx / Bazel / Lerna + custom]
   - Package manager: [with workspace config]
   - Versioning: [independent / locked / changesets]
3. DEPENDENCY MANAGEMENT — Rules for:
   - How packages depend on each other
   - Shared dependencies (hoisted vs local)
   - Version pinning strategy
4. CI/CD PIPELINE — Build only what changed:
   - Affected package detection
   - Parallel build and test strategy
   - Deploy pipeline per app
   - Cache strategy (local + remote)
5. DEVELOPER EXPERIENCE — How does a new developer:
   - Clone and set up in <5 minutes
   - Create a new package
   - Run/test a single package
   - Understand what depends on what
6. SCALING CONCERNS — What breaks at 50 packages? 100? 500? How to prevent it.

#monorepo#architecture#tooling#ci-cd#developer-experience

Works with

chatgptclaudecopilot

💡 Pro Tips

•Start with Turborepo if you're under 20 packages — it's the simplest
•The #1 monorepo mistake: not having a shared config package
•Remote caching can cut CI time by 80% — set it up on day one

✨ Example Output

TOOLING: Turborepo + pnpm workspaces
WHY: Best cache hit ratio for TypeScript projects and zero config. Nx is more powerful but overkill for your 3-person team.

STRUCTURE:
/apps/web — Next.js frontend
/apps/api — Express API
/packages/ui — Shared React components
/packages/shared — Types, utils, constants
/packages/config — ESLint, TSConfig, Prettier presets

NEW DEV SETUP: git clone → pnpm install → pnpm dev (everything runs)