This paper presents a qualitative case study that involved three groups of English as a foreign language pre-service teachers at a Colombian private university. Each group attended tutoring sessions during an academic semester. Along these sessions, students were asked to work collaboratively in the editing process of some chapters of their thesis project through a corpus interface. Students wrote journals and participated in interviews about their experiences. Teachers also wrote journal entries to describe and interpret their observations from the meetings. Findings reveal the participants' identities that emerged from their group dynamics and their insights about their collaborative process when editing academic texts.