A Morphia developer works with Morphia, a Java-based library, to map Java objects to MongoDB documents. They handle the creation, retrieval, update, and deletion of these objects in MongoDB, a NoSQL database. Morphia developers streamline the use of MongoDB by leveraging Morphia’s annotations and methods to simplify database operations. They also handle data aggregation, indexing, and querying. They work to ensure data integrity and optimize application performance. They may also configure and manage MongoDB instances, fine-tune queries and indexes, resolve data-related issues, and integrate MongoDB with other systems using Morphia.