Astrelsky focused on stabilizing the PyTorch Windows build, addressing cross-platform reliability within the pytorch/pytorch repository. Using C++ and leveraging expertise in build systems and Windows development, Astrelsky resolved a persistent build issue by reordering type declarations and relocating definitions across multiple C++ files. This technical approach fixed use-before-definition errors in constructors and destructors, reducing flaky builds and improving feedback cycles on Windows CI. While the work did not introduce new user-facing features, it laid a solid foundation for future Windows compatibility efforts and highlighted remaining gaps, demonstrating a methodical approach to enhancing developer productivity and cross-platform maintainability.