Worked on core infrastructure across ethereum/remix-project, ethereum/go-ethereum, and base/node, focusing on backend development and reliability. Refactored streaming API logic in remix-project using Go and TypeScript to reduce code duplication, improve error handling, and ensure consistent callback execution, resulting in more robust data processing. Addressed a fuzzing test in go-ethereum by correcting an error message for BLS12381 operations, clarifying debugging without altering functionality. Improved DevOps scripting in base/node by updating a shell script to reliably detect empty environment variables, strengthening startup configuration. The work emphasized maintainability, clearer error reporting, and smoother developer experience across multiple repositories and languages.