Anirban Karan contributed to the silvest/HEPfit repository by enhancing the accuracy and maintainability of theoretical physics models in C++. He corrected parameter calculations in the GeneralTHDMZ2 model, aligning the code with published research to improve the reliability of phenomenological predictions. In subsequent work, he refactored the R1p observable computation in GTHDM, incorporating next-to-leading order corrections and resolving sign errors to ensure consistency with canonical references. His approach emphasized rigorous version control, traceable commits, and adherence to established methodologies. Leveraging skills in C++ development, numerical analysis, and high energy physics, Anirban delivered focused, high-quality improvements to complex scientific software.