Aymane Ounzar contributed to the Stirling-Tools/Stirling-PDF repository by addressing a critical issue in PDF extraction workflows. Focusing on backend development and PDF manipulation using Java, Aymane engineered a solution to resolve page size discrepancies and metadata leakage when extracting pages from PDFs. The approach involved creating a new PDF document and copying only the selected pages, ensuring that the output maintained correct page sizes and clean metadata. This fix improved the reliability and integrity of exported PDFs, reducing downstream processing errors. The work demonstrated careful attention to data integrity and was well-documented for auditability and quality assurance purposes.