Nuxeo uses MongoDB for content management due to its scalability, speed, and ability to handle complex data structures, massive scalability, rapid retrieval, and heavy write access. Initially, Nuxeo used a SQL binding, but limitations such as scaling issues and performance problems led them to develop a MongoDB Connector and leverage the database's capabilities. Nuxeo's modular architecture allows for plugging in different storage backends, including MongoDB, which enables scalable metadata storage, search, or blob storage. By using MongoDB Atlas, Nuxeo can focus on delivering its Content Services Platform while relying on MongoDB for data safety and scalability. The company is now exploring new ways to deliver ECM applications using MongoDB Atlas, simplifying their deployment architecture and improving scalability for customers.