Zbigniew Piotrowski focused on stabilizing Fortran module support in the byrnHDF/hdf5 repository by addressing a critical build and installation issue. He resolved missing Fortran module dependencies by ensuring the h5vfd.mod file was properly exported and copied during installation, modifying the CMake configuration to include this module in the export list. This targeted bug fix improved the reliability of the build process and enhanced cross-language compatibility for Fortran and CMake users. Zbigniew’s work demonstrated a strong grasp of build system configuration and module packaging, delivering a precise solution that addressed a nuanced dependency problem within a complex codebase.