Software Engineering for the cloud (PaaS): The Twelve-Factor App

The twelve-factor app is a methodology for building software-as-a-service apps, based and developed by Heroku (GIT). It provides practical guidance for building decoupled, scalable, and easy-to-deploy applications and it it a recipe for building applications that are cloud and PaaS compatible. It also could be use in micro-services development, not only applications. The Twelve-Factor approach could be the baseline for modern application development: the “native PaaS architecture”.

Introduction (from 12factor.net)

In the modern era, software is commonly delivered as a service: called web apps, or software-as-a-service. The twelve-factor app is a methodology for building software-as-a-service apps that:

  • 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;
  • And can scale up without significant changes to tooling, architecture, or development practices.

The twelve-factor methodology can be applied to apps written in any programming language, and which use any combination of backing services (database, queue, memory cache, etc).

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