Donald Heddes contributed to the SimplifyJobs/Summer2025-Internships repository by focusing on data curation and user interface refinement. He addressed a bug affecting the accuracy of the 'days ago' count across multiple job listings, ensuring data integrity and a more reliable user experience. Working primarily with Markdown, Donald also enhanced the visual presentation of listings by applying a title emoji to the Samsung Memory Solution Research Engineer position, aligning with branding goals. His work demonstrated attention to detail in both data consistency and UI polish, though the scope was limited to a single bug fix and minor cosmetic improvements during the period.