Hiring an AWS ElastiCache developer can significantly boost your application's performance and scalability. They are experts in managing in-memory data store and cache services, which can drastically reduce latency and enhance the speed of data retrieval operations. They can also help optimize costs by efficiently managing resources. Additionally, they can ensure the reliability and robustness of your applications with ElastiCache's automated patch management, monitoring, and failure detection and recovery features. Their skills can be crucial in dealing with big data, IoT, real-time analytics, and high-speed transactions. Overall, they can help you leverage AWS ElastiCache to its full potential.