Developed a global chat provider configuration for the Shopify/roast repository, enabling users to set a single environment variable to override the default OpenAI chat provider across all workflows. The implementation introduced the ROAST_DEFAULT_CHAT_PROVIDER variable, with a clear precedence system where explicit workflow settings take priority, followed by the environment variable, and finally the built-in default. Validation and error handling were incorporated to ensure only valid configurations are accepted, raising errors for invalid values. This backend development work, primarily using Ruby and configuration management techniques, reduced repetitive setup for users and aligned with existing patterns for easier long-term maintenance.