After receiving his Master in Mechanical Engineering, Joost started working in the Natural Gas sector. In 2009, he joined NRG PALLAS as manager of the Safety and Licensing department. In this role, he guided several NPP licensing projects. After several positions and leading a company restructure in 2014, he is currently the Executive director Nuclear Energy Services. Nuclear Energy Services provides services in the field of nuclear technology for the safe and reliable operation of reactors and nuclear facilities, for processing radioactive waste and for protection against radiation.