Hiring a MongoDB developer is advantageous for managing big data and ensuring high performance, scalability, and availability of your business applications. They are skilled in creating database architectures, optimizing data retrieval, and implementing security measures. MongoDB's document-oriented database supports a wide range of data types, making it ideal for versatile, flexible, and agile development. Furthermore, they can help leverage MongoDB's full potential for data sharding, replication, and indexing, improving your application's efficiency and user experience. A MongoDB developer can offer a more robust, scalable solution for your data management needs.