An XR Developer builds immersive applications by programming interactions, integrating 3D assets, and optimizing performance for XR devices. Responsibilities include developing features, implementing spatial interactions, integrating sensors and hardware, and testing applications across platforms. Work spans gaming, healthcare simulation, education, training, and enterprise applications. Tools include game engines, XR SDKs, programming languages, and real-time rendering systems. Employment environments include technology companies, XR studios, startups, and research labs. Rapid expansion of immersive technologies drives very strong global demand.