Worked on the narwhals-dev/narwhals repository to enhance the reliability of dependency validation for data processing pipelines. Addressed a bug in the Modin.pandas import check by refactoring the logic to use sys.modules, ensuring the function returns the module if already imported or None otherwise. This approach reduced false negatives and minimized import-time errors, particularly in environments where Modin is preconfigured. Focused on Python development and dependency management, the update improved stability for both CI and production deployments. The work demonstrated attention to robust dependency hygiene, lowering the risk of runtime surprises and supporting smoother pipeline execution in Python-based systems.