João António Neves worked on FreeCAD’s core document handling, focusing on stability and data integrity. He addressed a bug where empty startup documents would disappear when switching between files, which risked unintended data loss. By introducing an autoCreated flag in the C++ codebase, he enabled the system to distinguish between auto-created and user-created documents. This allowed the document-switch lifecycle to close only auto-created empty documents, preserving user content and improving reliability for multi-document workflows. His work, implemented in C++ and Python, enhanced user trust in FreeCAD’s editing experience and demonstrated careful attention to workflow integrity and software robustness.