You have to stick with it. It takes time, patience, trial and error, failure, and persistence. It is almost never perfect or finished, but, with a good team, you can build something that works. These are the lessons youth learn when building a robot, as many do in the out-of-school time (OST) programs supported by the initiative described in this article. Similarly, implementing high-quality, sustainable programming in science, technology, engineering, and mathematics (STEM) across the largest publicly funded OST system in the country took time, teamwork, and persistence. In this article, the authors describe how the New York City Department of Youth and Community Development (DYCD) and the New York Academy of Sciences collaborated to develop a replicable program model for increasing the capacity of OST organizations to provide STEM learning opportunities. The process of developing this model and the lessons they learned provide a roadmap for other OST systems looking to enhance program capacity.