How you split your code into repositories seems like a plumbing decision, but it quietly shapes how your team collaborates, ships, and reasons about the system. A monorepo keeps everything in one repository; a polyrepo gives each service or app its own. Neither is universally right, and the loudest opinions online usually ignore your actual stage and team size. Here's how to think about it clearly.
What a monorepo buys you
A monorepo puts your web app, mobile app, backend, and shared libraries under one roof. The advantages are real, especially for smaller teams:
Atomic changes. Update a shared type and every consumer in the same pull request. No cross-repo coordination dance.
One source of truth for tooling. A single lint, format, and CI config instead of drift across a dozen repos.
