Modularity is a crucial concept when designing and creating software. Independent of whether our chosen architecture style is to have a single unit of deployment - Monolith or multiple units of deployment - Microservices/Services. It is a quality that should be treated completely independent of how many deployable units of software we choose to have.

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Modularity is the fundamental principle in software architecture, independent of whether you choose a monolith or microservices. The article explores five implementation strategies ranging from simple modular monoliths (modules as folders) to full microservices, emphasizing that good module separation based on domain understanding should drive architectural decisions, not the other way around. Key insight: start simple with a modular monolith and only increase complexity when justified by specific needs like resource optimization or team scaling. The author advocates for constrained microservices (microliths) that prohibit synchronous inter-service calls during request handling, reducing distributed system complexity while maintaining deployment independence.

Modular Monolith and Microservices: Modularity is what truly matters

Parallel work and independent deployments

<p>And the asynchronous communication between them! That’s another important point in my opinion.</p>
