Hiring a MongoLab developer brings several advantages to your project. First, they possess in-depth understanding of MongoDB, a popular NoSQL database, which is essential for handling large data sets and building scalable applications. Their familiarity with MongoLab (now known as MongoDB Atlas) ensures efficient use of this Database-as-a-Service platform for managing and scaling MongoDB deployments.

Secondly, they are proficient in various programming languages like Java, Python, Node.js etc., enabling them to work seamlessly in diverse development environments. They can integrate MongoDB with various applications, ensuring a smooth data flow and efficient application functioning.

Thirdly, MongoLab developers have expertise in cloud services. They can leverage the benefits of MongoDB Atlas, like automatic scaling, backup, and recovery, to ensure your application's high performance and availability.

Fourthly, their knowledge of database security is invaluable. They can implement security measures like encryption, role-based access control, and auditing to protect sensitive data.

Finally, they are adept at troubleshooting and optimizing performance. They can write efficient queries, create appropriate indexes, and manage database resources to ensure optimal performance.

Overall, hiring a MongoLab developer can significantly enhance the performance, scalability, and security of your project.