The presentation discusses Expedia's journey in leveraging graph databases across their brands, from managing multiple database technologies to creating a unified self-service infrastructure for developers. The company created a fully managed self-serve database platform called Cerebro, which allows developers to create high-quality products without managing databases. Cerebro supports single-click provisioning, scalable design, and automated maintenance. By using the Strangler Pattern, Expedia was able to transform legacy applications to use Neo4j/MongoDB architecture, improving security, governance, and productivity. The platform's design uses a root key architecture, allowing for lean storage in MongoDB and efficient querying of Neo4j. This unified approach enables Expedia to unify their platform across multiple brands, providing a single data store for reservations, users, and inventories.