Modularity describes the degree to which a system’s components may be separated and recombined. It refers to both the tightness of coupling between components, and the degree to which the “rules” of the system architecture enable (or prohibit) the mixing and matching of components.

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So if you work for a company that scales or has scaled like that at any point in their history, there comes a point when someone says the following: “It will never get easier to split into services”