Object-Oriented Design (OOD), Design Patterns, Json, Multithreading, Java, Debugging, Clearcase, Git, Version Control Systems, Opengl, Xml, JOGL, CBTC signaling, Performance optimization, 3D graphics visualization, Configuration-driven applications, Railway metro systems, Railway software development standards, Automated testing frameworks, Graphic animation development, Modular plugin-based architectures, Java 8+, Animation systems, Simulation