Abstract Students benefit from international study programmes in fields such as HCI. However, user-centred research in a foreign country has some challenges, especially language hurdles when going into the field and conducting ethnographic and participatory studies. A particular obstacle is added when targeting groups that do not speak English, such as in Germany, where English was not taught in schools until the 1970s. The task and challenge of the present project, ‘Research Buddy’, is to bring together young international students and older people as co-researchers in Germany. We describe the participatory development of the concept of a matching platform and its design. In focus groups with older people, university faculty and students, requirements for a collaborative research infrastructure were jointly identified and prototypically implemented. The empirical results focus on the possibilities the platform offers for qualitative citizen science in the field of age tech.

Abstract Interconnected global crises have emphasized the need for alternative visions of the future, making transformative action urgent. Consequently, Sustainable Human–Computer Interaction (SHCI) has seen growing interest in exploring means to support radical and sustainable change, starting with grassroots, community-driven endeavors. This study explores the concept of Utopian Design Space (UDS) in the context of surplus redistribution in grassroots communities. The objective is to understand how practical concerns and transformative ambitions intersect, creating spaces that foster sharing and caring practices. Through action-oriented research, we examine six local projects, highlighting ICT’s role in these initiatives. Our findings highlight the challenges and opportunities in managing values, scalability, sustainability and inclusivity within UDSs. We discuss how aligning ICT with community practices can foster socio-technical innovation and support transformative change, introducing the notion of prefigurative technology. These insights can help us envisage design spaces that foster utopian ideas like equitable resource distribution and generalized reciprocity.