During December 2025, Hadrien S. focused on improving the allenai/rslearn repository by addressing a critical issue in the Geometry Utility. He identified and corrected an error in the multiplication factor, switching from denominator to numerator, which restored accuracy to geometry calculations. This targeted bug fix enhanced data integrity for downstream analytics and model inputs, reflecting careful attention to mathematical detail. Hadrien applied his expertise in Python programming and data science, demonstrating precise debugging and clear git traceability. Although the period did not include new feature development, his work contributed depth by ensuring the reliability of core geometry calculation logic.