This paper outlines a novel model of community-engaged learning: "Building Bridges, Not Walls: The Democracy and Diversity Project." Inspired by the pedagogical horizontality of Paulo Freire and the applied disciplinary approach of "service sociology," Building Bridges pursues sustainable university-community partnerships with the goals of expanding democracy, diversity, and equity both in our community and among our undergraduate students. The model foregrounds the embedding of community engagement across our sociological curriculum in an iterative and flexible manner. We provide an overview of the model by describing its four constitutive stages: design, implementation, evaluation, and reflective revision. These stages are concretized through application to our public university and community in Portland, Maine.