Multilingual Academic Writing is a 12-week course that targets two major outcomes: (1) develop students' academic writing skills; and (2) prepare students for college writing. Using open educational resources (OER) and a variety of writing activities and assignments, students practice writing multiple genres, address different audiences, and metacognitively reflect on and evaluate their composing practices. Moreover, students can start building their writerly identities as they embark on writing experiences such as community-based writing and exploratory research writing assignments. These aspects of the course help students develop their writing and transfer writing knowledge to other contexts. The course design outlined in the article focuses on genre knowledge, audience awareness, and metacognition and on cultivating key writing dispositions, such as exploration and collaboration, for successful writing development and transfer.