Software that is delivered as a service (SaaS) is typically built while following the twelve-factor methodology.
Use declarative formats for setup automation, to minimize time and cost for new developers joining the project;
Have a clean contract with the underlying operating system, offering maximum portability between execution environments;
Are suitable for deployment on modern cloud platforms, obviating the need for servers and systems administration;
Minimize divergence between development and production, enabling continuous deployment for maximum agility;
The apps scale up without significant changes to tooling, architecture, or development practices.
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