While microservices are widely praised for enabling scale, they introduce massive network overhead, transactional complexities, and deployment pipelines. Many scaling startups are finding that a well-designed **Modular Monolith** is more efficient.

Defining Boundaries Inside a Single Process

A modular monolith keeps code logically separated (e.g., separating user auth, invoicing, and reporting modules) while running inside a single server process. This eliminates microservice HTTP call latencies and distributed database lock issues, while allowing teams to transition to independent microservices later if load spikes demand it.

Evaluate your team size and operational complexity before dividing your system into independent services; keeping it simple early saves hundreds of hours of infrastructure maintenance.