Tatiana Gelafromer contributed to the nf-core/modules repository by addressing a critical bug in the Cellranger mkfastq downstream processing pipeline. She restructured the workflow to split index and primary FASTQ files, emitting them through explicit output channels using Nextflow and Groovy. This technical approach improved compatibility with downstream modules and enhanced data integrity for sequencing runs. Tatiana updated associated tests and metadata in YAML to ensure the new outputs were accurately reflected, adding regression coverage for both read and index FASTQ emission. Her work reduced troubleshooting time and minimized failed runs, demonstrating depth in bioinformatics pipeline development and maintenance.