Developed stable sorting functionality for pulse groups and photon propagation by pulse ID within the XENONnT/fuse repository, focusing on enhancing data integrity and reproducibility in scientific analyses. Leveraged Python and the strax.stable_sort and strax.stable_argsort utilities to implement deterministic ordering, ensuring consistent results across multiple data processing runs. The work emphasized reliability and traceability in the data pipeline, with all changes tracked through Git for transparent version control. This feature addressed the need for reproducible downstream analyses by providing stable data ordering, demonstrating skills in algorithm implementation, data processing, and scientific computing without introducing new bug fixes during the development period.