Andrew Choi enhanced observability for the CDCgov/data-exchange-upload repository by developing a logging feature that embeds upload IDs into all upload-related log entries, enabling end-to-end traceability of events. He refactored logger initialization into a reusable setup function and consolidated log utilities to standardize formatting and reduce code duplication. Using Go and applying backend development and system design skills, Andrew also introduced a no-op S3 appender to improve traceability and debugging without affecting production behavior. His work addressed the need for faster incident response and root-cause analysis, laying a foundation for more reliable and maintainable data ingestion workflows.