Hiring a CORS (Cross-Origin Resource Sharing) developer is crucial for ensuring secure and efficient web application functionality. They enable interaction between multiple servers, crucial for web apps accessing data from different domains. Their expertise helps in avoiding potential security risks, enhancing user experience, and ensuring seamless data flow. They understand the complexities of cross-origin requests, ensuring your application complies with web security standards. Therefore, a CORS developer plays a significant role in web application development, data security, and enhancing the user interface, which contributes to the overall success of your digital platforms.