Hiring an Apache ReST developer can be instrumental in developing, testing, and debugging RESTful APIs. They can ensure seamless communication between different components of your web-based applications, enhancing functionality and user experience. Their expertise can help in handling data formats like XML and JSON effectively. They can also assist in implementing security measures to protect sensitive data, ensuring API's scalability for handling large amounts of data, and maintaining API documentation for better collaboration and future reference. Overall, they can help optimize your web services infrastructure, leading to improved business operations.