Worked on the buildkite/agent repository to enhance job logging by introducing structured JSON logging and modularizing the logging system for improved maintainability. Leveraged Go to refactor logging logic into dedicated modules, enabling clearer separation of concerns and easier future updates. Implemented support for W3C trace correlation by parsing traceparent headers and including trace_id and span_id in logs, which improved traceability and debugging across CI pipelines. Developed comprehensive tests for traceparent parsing and structured fields to ensure reliability and guard against regressions. This work improved observability, streamlined auditing, and enabled faster issue resolution for backend development workflows.