Hiring a Mongoose ODM (Object Data Mapping) developer comes with several advantages. First, they provide a straightforward, schema-based solution to model your application data, which includes built-in type casting, validation, and query building. This makes your code more organized, manageable, and secure.

Secondly, Mongoose developers can create complex, rich and robust data structures, enhancing the functionality and user experience of your application. They can also handle asynchronous operations, which is crucial for web applications that require real-time updates or high responsiveness.

Thirdly, Mongoose developers have the expertise to leverage MongoDB, one of the most powerful NoSQL databases. This means they can handle large amounts of data and high load on your website or application with ease.

Moreover, they can save you time and resources by using pre-built plugins to add additional features to your application. They also ensure data consistency by using Mongoose's middleware and validation rules.

Finally, working with a Mongoose developer allows you to benefit from their experience in handling database versioning, a common issue in application development. They can ensure that your data schema evolves smoothly over time, reducing the likelihood of errors or data loss. Overall, hiring a Mongoose ODM developer can significantly enhance your application's performance, scalability, and stability.