Twelve-Factor App A methodology for building portable, resilient, and scalable software-as-a-service applications. Originally codified by the Heroku team and applicable to apps written in any programming language using any backing service combination. When to Load Which Resource | Task / Topic | Load Resource | Key Factors | |---|---|---| | Source control, versioning, or package management | | I. Codebase, II. Dependencies | | Environment variables, secrets, or external service connections | | III. Config, IV. Backing Services | | CI/CD pipelines, release management, or deployment separation…