12.1 Factor Apps: Dev/Prod Parity

The 12.1 factor app strives for dev/prod parity where practical and eschews it when not. This requires differenating between bounded and unbounded contexts.

The 12.1 factor approach prefers locality over fully integrated environments. Doing so promotes fast and independent iterations on discrete services using automated tests to verify correctness. End-to-End issues that may have been identified with a fully integrated environment with dev/prod parity should be pushed downstream in the deployment pipeline in accordance with test pyramid principles. If a regression is identified, then it may quickly addressed by adding tests to the relevant service’s test suite.

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2020 Adam Hawkins