This article discusses the relevance of militant ethnography as a collaborative and politically engaged form of knowledge production for the study of Latin American social movements. Drawing on my militant ethnographic research with four autonomous groups from Chile and Mexico, the article presents a reflective account of my experience as a militant researcher throughout the different stages of the inquiry. More specifically, I describe the ethical and methodological procedures carried out in the field and their importance in fostering collaboration and horizontality. Furthermore, I discuss the challenges of conducting militant ethnography within Latin American autonomous movements whilst pursuing doctoral studies in a European university and an English-speaking country. Finally, by acknowledging the tensions resulting from my multiple and entangled roles, I suggest an alternative route to militant research that challenges the temporalities and spatialities of traditional research designs and proposes an ongoing process of collaboration and solidarity in the post-fieldwork stage.