Asfandyar Qureshi enhanced the mosaicml/composer repository by adding legacy PyTorch image support to the container build matrix, focusing on Ubuntu 20.04 with specific CUDA variants. He updated Dockerfiles and CI/CD workflows using Docker, YAML, and Python to integrate these new build configurations, enabling reliable testing and deployment for legacy workloads. His work improved compatibility and reproducibility across environments, addressing the need for broader test coverage without introducing new bugs. By maintaining clear, commit-based documentation, Asfandyar ensured future maintainability and auditability. The depth of his contributions lay in infrastructure improvements that strengthened build automation and supported legacy system requirements.