Anatomy of Distributed System à la Lokad

This is an update of my previous post on Building Blocks à la Lokad. It is based on improvements of the understanding and terminology thanks to Vaughn Vernon. It also shamelessly borrows from the subject of my continuous fascination: biology and nature itself. Let's start with the high-level overview of a Software-as-a-Service company (SaaS). This company could employ a range of systems needed to deliver its services to customers. Systems will be separate to reduce coupling and reduce the friction, as company evolves and grows (smaller the company is, more important this becomes).