Pavel Zwerschke migrated the packaging build system for the Quantco/glum repository from conda-build to rattler-build, focusing on improving reproducibility and streamlining the release process. He updated CI/CD configurations and packaging recipes using Python and YAML, ensuring that builds remained consistent across environments. By consolidating build tooling and modernizing the pipeline, Pavel reduced maintenance overhead and laid the foundation for future automation. Although the work spanned a single feature without bug fixes, it demonstrated depth in build systems and package management. This migration addressed long-term maintainability and positioned the project for faster, more reliable packaging and deployment cycles.