Worked on targeted code quality improvements in the pymor/pymor repository, focusing on the Loewner module. Standardized the syntax of pytest fixture decorators by removing redundant parentheses, which improved both readability and compliance with linting standards. Applied a Ruff-based lint pass to enforce consistent style and reduce continuous integration noise, ensuring that the changes did not affect existing tests. The work enhanced maintainability and made the test suite more accessible for new contributors. Utilized Python as the primary language, with an emphasis on code formatting and testing practices to support long-term code health and facilitate smoother onboarding for future development.