Giacomo Santoni worked on tuning the ECAL geometry in the DUNE/dunendggd repository, focusing on aligning the detector’s active and passive slab thicknesses with precise specifications to improve simulation fidelity. Using Python and Markdown, he adjusted configuration files to set the active slab to 620 µm and the passive slab to 480 µm, directly addressing detector performance requirements. His approach emphasized configuration management and thorough documentation, updating the CHANGELOG.md to ensure traceability of geometry changes. This work established a more robust foundation for future ECAL optimizations, enhancing both the accuracy of detector simulations and the maintainability of configuration records.