How to write about it — Modular monolith or microservices: how to choose

Recommended structure

1. IntroductionChoose architecture around team size, deployment needs and operational capacity rather than fashion.
2. One app can have clear boundariesA modular monolith deploys as one application but separates customers, orders and billing in code. This can suit a small product team: deployment stays simple while modules clarify business responsibilities.
3. Microservices add operational workIndependent services can deploy and scale separately. They also add network failures, distributed tracing and consistency challenges. If an order succeeds but payment fails, recovery needs design. More repositories alone do not create independent business services.
4. Decide from a real requirementDoes one feature need its own release cycle, scaling pattern or owning team? If not, improve modularity first. Document decisions and test boundaries so extraction remains possible when the product actually needs it.
5. ConclusionChoose the simplest architecture that meets real deployment and ownership needs.