This article [explores] the learning of girls who were in a co-ed after school engineering club related to the project: Designing Vital Engineering and Literacy Practices for Science, Technology, Engineering, and Math for Elementary Teachers and Children (DeVELOP STEM ETC). While few girls grow up to become engineers in the US, recently more attention has focused on practices that engage girls in order to grow interest in engineering and engineering careers. In this article, we follow three eight and nine-year-old girls (3rd graders). We illustrate how key features of the Engineering Design Process intersect with a multimodal model of Productive Communication to help the girls enact identities as girls and as engineers as they design and build a bridge. We argue that to enact the Next Generation Science Standards, particularly those related to engineering, engineering and STEM educators must attend to the disciplinary literacies and communicative modes of girls and other under-represented minorities. This is also particularly important for learners who are still new to learning English and who may benefit from multimodal interactions and diverse opportunities to learn.