Worked on the Shopify/shopify-app-js repository, focusing on both production reliability and code quality. Addressed a critical issue where essential adapters were being stripped during production tree-shaking by introducing initialization constants, ensuring that web API and Cloudflare Worker adapters loaded reliably and reducing runtime errors across environments. In addition to backend reliability improvements using Node.js and TypeScript, also enhanced maintainability by implementing and enforcing linting and formatting standards throughout the codebase. This work improved CI reliability and made onboarding easier for new contributors. The contributions reflect a methodical approach to both stability and long-term code health in a full stack context.