Rolls-Royce is seeking an Aerothermal Engineer to design, analyze, and simulate various gas turbine system components and sub-systems using methodologies such as meanline, throughflow, and computational fluid dynamics (CFD). The role involves working with performance organizations and system-level design to define and interpret sub-system requirements, overseeing component and sub-system tests, and reporting on CFD simulations and experimental results. The position emphasizes continuous improvement and collaboration across various engineering disciplines.