In today's world of global migration and urbanization, millions of children are separated from parents. Their mental health and future competences as citizens depend on the quality of care from foster parents and group home staff in nonparental care settings. Caregivers are challenged by poor work conditions, too many children, and a lack of knowledge about care for traumatized children. How can our profession match this challenge by upscaling interventions? Digital designs for applications of psychology are growing, recently accelerated by the COVID-19 crisis. From 2008, the author developed a blended learning intervention. In partnerships with nongovernmental organizations and government agencies, care recommendations from an international network of researchers are transformed into start-up seminars for staff, followed by a 6-month online classroom education. Students learn and practice how to train local caregiver groups in attachment-based care, using training sessions developed in local languages, adjusted to culture. At present, the author's Fairstart Foundation educated 500 staff from partners in 26 countries, who have trained the caregivers of some 40,000 children. The theoretical, logistic and technical steps from research to daily caregiver-child practices are described, to inspire discussions of how online designs and international partnerships may benefit underserved populations. (PsycInfo Database Record (c) 2020 APA, all rights reserved).