From 2017 to 2020, Raúl Bartolomé led Harman’s European hardware engineering department, delivering advanced audio amplifiers and multimedia systems for brands such as BMW, Audi, Daimler, Volvo, Volkswagen, Aston Martin, and Ferrari. His leadership guided the development of multi-channel DSP amplifiers, Class D/AB output stages, tuners, and communication buses, enabling flagship systems like the BMW Bowers & Wilkins Diamond, Mercedes-Benz Harman Kardon, and Audi Bang & Olufsen sound systems.