This paper discusses the use of duoethnography in the internationalization of language teacher education, aiming at responding to the following questions: A) how may duoethnography support the internationalization of language teacher education? B) What aspects of language teachers' lives can be explored in dialogical encounters among language teachers and teachers-to-be from different countries? C) What (lasting) impacts may carrying out a duoethnography have on language teachers? Beyond explaining the process of designing an international research-based assignment (IRBA), which aimed at engaging in-service and pre-service language teachers from the U.S. and Brazil in exploring their linguistic experiences, the authors present the rationale and the theoretical basis for developing the IRBA and analyzing the duoethnographies: critical approaches to language teacher education, digital literacies and technology integration in educational praxis, teacher collaboration, and duoethnography as both a process and a method. The analysis revealed that duoethnography may be effective leading to reflection and contributing to issues of equality, mobility, and access.