Worked on enhancing error handling for the Proxyd component within the ethereum-optimism/infra repository, focusing on backend development using Go. Developed a generic error handling framework that expanded error mapping and standardized the categorization of transaction-related errors across multiple backend implementations. This approach improved the reliability of transaction processing by enabling the system to handle a broader range of errors and reducing ambiguity during incident response. The enhancements also improved observability and troubleshooting capabilities, making it easier to diagnose proxyd-related failures. The work established a single-source framework that supports future backend integrations and streamlines onboarding for new backend systems.