Worked on core improvements to the sanity-io/sanity and sanity-io/groq-js repositories, focusing on schema extraction and release management. Addressed reliability issues in GraphQL schema generation by refining nested union reference handling, which reduced errors and stabilized API surfaces for Sanity projects. Enhanced the groq-js library by updating the test suite for ContentReleases and correcting logic in versionOf and partOfRelease functions, improving correctness and maintainability. Applied code refactoring and rigorous testing practices using JavaScript and TypeScript, with attention to type systems and input validation. Prioritized robust, maintainable solutions that align with evolving project requirements and support complex content workflows.