Worked on web-infra-dev/rsdoctor and getsentry/sentry-mcp, focusing on TypeScript declaration generation, ESM compatibility, and public API stabilization. In rsdoctor, implemented TypeScript type declarations for the agent-cli package and refactored module imports to use Node.js’s createRequire, improving compatibility with ESM environments. Enhanced CLI argument handling by ensuring immutability, contributing to more robust command parsing. In sentry-mcp, addressed TypeScript errors by exporting a local StdioServerContext type, preventing private types from leaking into the public API. The work demonstrated strong skills in TypeScript, Node.js, and build configuration, with a focus on maintainability and downstream consumer impact.