Worked on the GTNewHorizons/Applied-Energistics-2-Unofficial and GTNewHorizons/GT5-Unofficial repositories, delivering three features focused on maintainability and extensibility. Introduced interface-based fluid detection by replacing hardcoded class checks, allowing for more flexible support of fluid interface variants. Refactored the crafting subsystem by adjusting field access modifiers and removing final keywords, improving subclassing potential and future extensibility. Overhauled terminal GUI textures to enhance visual clarity and styling within the game interface. All work was implemented in Java, leveraging object-oriented programming, interface-based design, and refactoring techniques to streamline future development and improve code quality without addressing any major bugs.