A Mongoose ODM (Object Document Mapper) developer utilizes the Mongoose library to create MongoDB database schemas for Node.js applications. They design, implement, and manage NoSQL databases, ensuring data integrity and consistency. They also build models, run queries, and handle data relationships using Mongoose's API. The developer handles data validation, creates middleware for pre and post-save operations, and uses Mongoose's hooks for asynchronous functions. They optimize application performance by managing indexing and transactions. The developer's role also involves troubleshooting and resolving database-related issues. They work closely with other developers, integrating Mongoose ODM into the application's backend architecture.