The Pioneer Alliance together with the NTUA Department of Transportation Planning organised with great success the PIONEERing Solutions for the Smart City Challenge, which was held online on 15 April 2021. Through this Workshop, students had the opportunity to learn about civil engineering for carbon-neutral urban areas, safety, security and risk management for resilient cities, technology enhanced solutions for smart cities, service design for future sustainable cities, circular economy for urban cities and sustainable urban life and tourism.  NTUA actively contributed with the following presentations: