Monorepo vs Polyrepo: What Actually Matters When You’re Building at Scale

The repository strategy is not really a Git decision. It is an architecture, ownership, and team-boundary decision. When a team starts building multiple services, one question usually appears sooner or later: Should we keep everything in a monorepo, or should every service have its own repository? The discussion often turns into a familiar list: Monorepo = easier collaboration Polyrepo = better isolation Monorepo = easier refactoring Polyrepo = better team autonomy All of these can be true. And yet, they don't answer the question that actually matters: Which repository structure will make our engineers more effective as the system and organisation grow? After working with distributed systems, microservices, shared libraries, CI/CD pipelines and multiple engineering teams, I've found that the repository itself is rarely the root problem. The more important questions are: Who owns the code? How often do services change together? How tightly coupled are the teams? How are