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The twelve-factor app is a methodology for building software-as-a-service apps.
Any developer building applications which run as a service. Ops engineers who deploy or manage such applications.
The Twelve Factors
One codebase tracked in revision control, many deploys
Explicitly declare and isolate dependencies
Store config in the environment
Treat backing services as attached resources
Strictly separate build and run stages
Execute the app as one or more stateless processes
Export services via port binding
Scale out via the process model
Maximize robustness with fast startup and graceful shutdown
Keep development, staging, and production as similar as possible
Treat logs as event streams
Run admin/management tasks as one-off processes