During March 2025, Tobias Bladh enhanced the pytorch/executorch repository by optimizing its build system for greater reproducibility and efficiency. He developed a feature that made the re-download of Ethos-U dependencies optional during CMake configuration for the executorch_runner, allowing offline builds when dependencies are already present. This approach reduced network usage, build times, and CI variability, directly supporting ARM backend improvements. Tobias applied skills in CMake, build configuration, and shell scripting to implement conditional dependency management, resulting in faster, more reliable builds and smoother onboarding for contributors. The work demonstrated thoughtful engineering depth in addressing reproducibility and resource constraints.