Tianyu Zhu developed stable sorting functionality for pulse groups and photon propagation by pulse ID in the XENONnT/fuse repository, focusing on deterministic data ordering to enhance reproducibility in scientific analyses. Leveraging Python and the strax.stable_sort and strax.stable_argsort utilities, Tianyu implemented algorithms that ensure consistent ordering of photon and pulse group data, which is essential for reliable downstream processing. The work emphasized data integrity and traceability, with all changes tracked via Git. Although the scope was limited to one feature over a month, the contribution addressed a core need for reliable data processing in scientific computing workflows.