Hiring a GameCenter developer provides numerous advantages. Firstly, they have an in-depth understanding of the GameCenter framework and can leverage its capabilities to integrate multiplayer features, achievements, leaderboards and more, enhancing the user experience. They can create competitive and social gaming experiences that can drive user engagement and retention.

GameCenter developers are also familiar with the Apple ecosystem. They understand the guidelines and policies that Apple has for its apps, ensuring the game is compliant and avoids potential issues during the review process. They can optimize the game for various Apple devices, which can lead to a broader user base and increased revenue.

Being proficient in Swift or Objective-C, GameCenter developers can create efficient, optimized code that performs well even for resource-intensive games. They can also ensure that the game works seamlessly with other Apple technologies like iCloud, ensuring a smooth and consistent user experience across devices.

They also have the ability to implement GameKit APIs for features such as real-time matches, turn-based matches, and more, which can make your game more interactive and fun.

In summary, a GameCenter developer can leverage their specialized knowledge to create engaging, compliant, and optimized games for the Apple ecosystem, potentially leading to higher user engagement and increased revenue.