In March 2026, Ivan focused on enhancing document serialization stability and performance in the DS4SD/docling-core and DS4SD/docling repositories. He addressed critical bugs in Markdown and HTML backends, specifically resolving hangs and rendering errors caused by nested rich tables. Using Python and leveraging skills in algorithm optimization and backend development, Ivan introduced helper functions for nested-table detection and improved memory management during export processes. His work included updating tests, refining data structures, and applying code formatting standards. These changes reduced memory-related risks and improved output fidelity, resulting in more reliable and maintainable document processing for complex Markdown and HTML content.