This article focuses on the experiences, good practices, as well as challenges faced by higher education institutions (HEIs) when they collaborate as part of a university alliance to establish new online programs and courses. The specific alliance discussed here consists of six different HEIs, collectively known as the Ulysseus European University. The main objective of Ulysseus is to create a dynamic and adaptable European University alliance to modernise European universities. Additionally, Ulysseus aims to promote the understanding and practice of European values and advocate for a globally engaged model of European universities.The research presented in this study is based on a theoretical framework that examines collaborative practices among teachers in online environments and acknowledges the importance of multilingualism in contemporary European education. By investigating the interplay between these two key areas, the research seeks to provide insights into the complex dynamics that shape teaching and learning in the digital era, while also offering valuable perspectives on collaborative approaches to designing courses.To achieve also practical contribution, we will describe how international teacher teams in two different fields collaborate remotely using technological solutions when planning a new kind of international cooperation, how the different parties experience the process and how multilingualism is implemented on several levels of the co-operation.