Jeffrey Gomez developed and expanded core gameplay systems for the jeffreydgomez/warhammer_fantasy_universalis repository, focusing on modular content such as mercenary companies, mission trees, and great projects. He used scripting and configuration file management, primarily in plain text and yml formats, to implement features like faction-specific mercenaries, artifact management, and estate mechanics. His work emphasized data-driven design, enabling scalable updates and maintainability. By refining recruitment logic, balancing unit attributes, and enhancing localization, Jeffrey improved both gameplay depth and stability. The engineering approach demonstrated careful version control, clear commit traceability, and a focus on robust, extensible game data management practices.