An RFIC (Radio Frequency Integrated Circuit) Design Engineer is responsible for designing, simulating, and testing RF circuits used in wireless communication systems. They work with technologies like CMOS, SiGe, and GaAs to develop components such as amplifiers, mixers, and oscillators. Their role involves circuit design, layout, electromagnetic simulations, and validation to ensure performance meets industry standards. RFIC Design Engineers collaborate with cross-functional teams, including system engineers and layout designers, to optimize performance and manufacturability.