Decomposing a Monolith: Strategies

Most systems do not start as microservices. They start as working monoliths with real users, revenue, and years of business logic.

Migrating them is not a clean design exercise. It is a live-system change, so safety matters more than ambition.

The usual approach is incremental: extract one service, learn from it, then extract the next while the monolith keeps running.

This chapter covers where to cut, what to extract first, and how to move data and behavior out without downtime.