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The 12 Factor Pattern is a software methodology for building cloud-friendly (or cloud-native), scalable, maintainable applications that deploy easily on a Platform-as-a-Service (aka PaaS).

It is a language agnostic, “Best Practice” for writing Cloud Native applications that can be easily and consistently deployed using Continuous Integration and Continuous Delivery (“CI/CD”).

The pattern can be summed up as:

  • (a) treat all apps as disposable services that receive their configuration via environment variables;
  • (b) rely on backing services to provide durability;
  • (c) script all changes; and
  • (d) treat all environments (dev, prod, qa, etc) as identical.