During January 2025, Dan Horn enhanced the nf-core/sarek repository by developing a targeted performance optimization for the GATK GenomicsDBImport process within the Whole Exome Sequencing (WES) workflow. Leveraging Groovy and Nextflow, Dan introduced a conditional --merge-input-intervals option that activates when the --wes parameter is specified, addressing bottlenecks caused by large interval target files. This approach reduced excessive intermediate file creation and long processing times, improving scalability for WES analyses while maintaining backward compatibility. Dan’s work focused on feature enhancement and stability, aligning with nf-core quality standards and demonstrating depth in bioinformatics workflow engineering and genomics.