Hiring a MongoDB developer brings numerous advantages to your organization. Firstly, MongoDB is a NoSQL database that provides high performance, high availability, and easy scalability. It works on the concept of collections and documents, making it simpler to organize and manage data.

A MongoDB developer can handle large amounts of data with varying types of structure, from simple key-value pairs to more complex hierarchical tree structures. This flexibility can significantly speed up the development process.

MongoDB developers can help your business leverage this database's built-in sharding feature, which allows for horizontal scaling - a significant advantage when dealing with big data. This makes your applications more efficient and faster in handling extensive databases.

The developers can also use MongoDB's GridFS feature for storing and retrieving large files such as videos or images. This is a more efficient method than what’s provided by traditional relational databases.

Moreover, MongoDB developers can take advantage of the rich queries that MongoDB offers, including field, range queries, and regular expression searches. These queries can be used to improve the user experience by making data retrieval more efficient.

Finally, MongoDB developers can help your organization keep pace with the rapid evolution of data by continuously integrating new features and improvements. This ensures your applications remain robust, scalable, and efficient in handling your data needs.