Modular Monoliths

A modular monolith can be a senior engineering choice for teams prioritizing speed and debuggability. A modular monolith can provide separation of concerns, domain ownership, and limited blast radius without premature distribution costs. Monoliths can simplify failure inspection through a coherent execution context. Monolith function calls are vastly faster than calls across microservice network boundaries. For most applications, the article frames modular monoliths as the right current architecture while preserving microservices for real scaling or organizational needs. A modular monolith keeps one deployable unit while enforcing clean internal module boundaries. A clean module should have a hard internal API, a coherent domain, and no leakage of internal rules into unrelated modules. Microservice architectures can make on-call debugging cognitively burdensome. A modular monolith is presented as the default architecture for most applications. Services should be extracted only when a measured problem forces the change. A modular monolith can later support service extraction when there is a measurable reason.