Developer guide for migrating to reproducible environments without rewriting

Greg Qualls outlines a strategy for migrating to reproducible environments without rewriting existing infrastructure-as-code (IaC) configurations, emphasizing a configuration-first approach that captures application intent rather than rebuilding applications. The guide proposes an incremental migration path that maintains production-identical environments by starting small with a single feature branch and leveraging tools like Upsun for configuration management. It highlights the importance of addressing environmental "drift" across runtime engines, operating systems, and service topologies, and suggests automated solutions for data context gaps, such as sanitized production clones and automated PII-scrubbing scripts. The approach aims to minimize workflow disruptions by ensuring seamless integration with existing tools and emphasizes the benefits of faster triage times and reduced "Ops work" for developers, ultimately leading to a more stable and consistent development environment across all stages.

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