Developed and stabilized the MQT core data model for the NA Default QDMI device within the cda-tum/mqt-core repository, focusing on enhancing the reliability and maintainability of quantum device operations. The work involved preserving tuple structures and clarifying site and type definitions, which improved the handling of qubit operations and site management. By aligning changes with tracked issues, the developer ensured better traceability and governance in the codebase. Utilizing C++ and Python, along with expertise in quantum computing and software testing, the contribution established a robust foundation for future enhancements and supported long-term stability in the MQT core architecture.