Gustavo Paixao contributed to the DUNE/duneopdet repository by delivering a targeted bug fix that improved the accuracy of photodetection efficiency (PDE) interpretation in the optical detector configuration. He identified and corrected a misrepresentation of PDE values, converting them from absolute numbers to decimal percentages within the FHiCL-based configuration files. This adjustment ensures that downstream calculations and detector simulations now reflect the true detector response, reducing the risk of biased results in physics analyses. Gustavo demonstrated skills in configuration management and version control, following a reproducible, review-driven workflow that supports reliable calibration and traceable code changes for future development.