SAPIENS will train a new generation of highly-skilled leaders in developmental science, prepared to work in an intersectorial environment. Within the network, a group of 15 Early Stage Researchers (ESRs) will receive a comprehensive training focused on delivering cutting-edge scientific research. Our philosophy of ESR training mirrors our scientific approach. ESRs will co-develop their expertise in the context of engagement in both research and training with their mentors, increasingly developing their independence and autonomy. In this way we want to prepare the ESRs for future work in diverse institutional environments (academia, SMEs, public service, NGOs) along a variety of career paths including basic research, clinical translation, applied technology, and public policy.