Building Microservices: Designing Fine-Grained Systems

by Sam Newman

Principles Principles are rules you have made in order to align what you are doing to some larger goal, and will sometimes change. For example, if one of your strategic goals as an organization is to decrease the time to market for new features, you may define a principle that says that delivery teams have full control over the lifecycle of their software to ship whenever they are ready, independently of any other team. If another goal is that your organization is moving to aggressively grow its offering in other countries, you may decide to implement a principle that the entire system must be portable to allow for it to be deployed locally in order to respect sovereignty of data. You probably don’t want loads of these. Fewer than 10 is a good number — small enough that people can remember them, or to fit on small posters. The more principles you have, the greater the chance that they overlap or contradict each other.

Architecture Principles