Worked on enhancing heavy neutral lepton (HNL) decay modeling in the SBNSoftware/sbncode repository, focusing on improved simulation fidelity for particle physics analyses. Developed features in C++ to introduce anisotropic decay distributions, polarization handling, and three-body angular rotations within HNL simulations, leveraging the CLHEP random number generator for reproducibility. Updated configuration management in SBNSoftware/sbndcode by aligning HNLMakeDecay settings with the latest sbncode release, ensuring consistent behavior across repositories. These changes improved the accuracy and maintainability of HNL decay simulations, supporting more reliable event generation and analysis workflows while utilizing skills in C++, configuration management, and physics simulation.