Ethical value exchange is moving to the forefront of the global challenges that HCI will have to address in the coming years. We argue that applying a context-sensitive, socio-technical approach to HCI can help meet this challenge. The background is that the life of marginalized people in contemporary society is challenging and uncertain. The marginalized can face health and cognitive issues as well as a lack of stability in social structures such as family, work and social inclusion. Three questions are of concern when innovating together with people ‘at the margins’: how can we describe users without stereotyping badly, what socio-technical HCI methods fit the local context, and how to make the design sustainable in the face of current planetary challenges (e.g., climate change)? We discuss a socio-technical HCI approach called human work interaction design (HWID) to meet the challenges of designing for ethical value exchange where value extraction is not dominated by one party but equally shared across all stakeholders. We introduce an ongoing case of a digital service to support fishers in Alibaug, India. As a multidisciplinary team of researchers we evaluate the socio-technical infrastructure surrounding a mobile app to support sustainable fishing. This is done through the lens of HWID by highlighting inwardly and outwardly socio-technical relations between human work and interaction design. We conclude by highlighting the value of a context sensitive, ethical socio-technical framework for HCI.