Worked on the folio-org/mod-lists repository to address a critical issue in the ListExportController’s streaming data export. Focused on backend development using Java and Spring Boot, the work involved updating the Content-Type for streamed exports from TEXT_CSV to APPLICATION_OCTET_STREAM and refining response headers to ensure accurate content negotiation. This change enabled downstream systems and sidecars to reliably interpret and process streaming data, reducing integration errors and improving export reliability. The solution was delivered through targeted bug fixes rather than new features, demonstrating a precise approach to API development and testing within a complex data export workflow.