Worked on the Fellow-Consulting-AG/docbits repository, delivering two major feature releases over two months focused on enhancing document processing, workflow automation, and system reliability. Introduced ZUGFeRD 2.1+ support, external API integration, and group-based document visibility, enabling improved interoperability and compliance. Implemented asynchronous export, optimized PO saving, and advanced application caching to accelerate workflows and support higher loads. Upgraded dashboard usability and approval history for better stakeholder visibility and traceability. Maintained comprehensive documentation and release notes using Markdown, ensuring clear communication of changes. Emphasized stability and scalability through targeted fixes and thorough documentation updates, supporting onboarding and reducing support requests.