Aymane Ounzar focused on backend development and bug fixing for the Stirling-Tools/Stirling-PDF repository, addressing a critical issue in PDF extraction workflows. Using Java and PDF manipulation techniques, Aymane engineered a solution to resolve page size discrepancies and metadata leakage when extracting pages from PDFs. The approach involved generating a new PDF document and copying only the selected pages, ensuring that the output maintained correct page sizes and clean metadata. This targeted fix improved the reliability and data integrity of exported PDFs, reducing downstream processing risks. The work demonstrated careful attention to detail and readiness for integration into quality assurance pipelines.