Worked on the SegmentLinking/cmssw repository to deliver integration of GE21 detector chambers and resolve geometry overlap issues within the simulation framework. Using C++ and leveraging expertise in detector simulation and high energy physics, implemented changes that improved the accuracy of detector geometry and data analysis. The approach focused on enhancing the maintainability of the codebase and reducing systematic uncertainties in downstream analyses. By addressing geometry overlaps, the work streamlined simulation workflows and prepared the system for upcoming physics campaigns. The contribution demonstrated a strong grasp of CMSSW geometry management and detector integration, with an emphasis on robust, physics-driven engineering solutions.