Procore, a rapidly growing construction project management platform, has transitioned from a product to a platform largely through the development of its open API. The API, which allows full CRUD functionality across all modules, empowers third-party developers to create custom integrations and solutions, thereby enhancing the construction management process. Notable integrations include Botlink's drone technology for live visual updates and SmartSheet's enhanced efficiency. The API's development was challenging, particularly in terms of design consensus and user communication, leading to the creation of a Developer Experience team to ensure a seamless experience. Procore's strategic partnerships, facilitated by the API, aim to provide new capabilities for clients and expand the App Marketplace, while continuing to prioritize an excellent developer experience.