The paper examines the connection between discursive and non-discursive features and the construction of writer identity. In particular, the paper compares and contrasts the writer identity development of two groups of undergraduate students of applied linguistics in the Mexican context, one made up of locally educated ones and the other composed of returning migrants from the USA. Through a combination of the analysis of various essays written by the participating students at different stages of their academic program and a discourse-based interview methodology, the study looks at the ways in which and the extent to which differences in international experience, professional experience and teacher education background influence the development of an essential academic identity. The results show that returnees made less use of first person pronouns and more use of sophisticated linguistic choices such as topic sentences, supporting details, and citations to strengthen their arguments and to convey their identity than their locally educated peers. However, the results also make evident the role played by non-discursive features, particularly their positioning, in the understanding of writer identity. Implications for writing instructors and further research are discussed.