Hiring a CQRS (Command Query Responsibility Segregation) developer can significantly enhance your system's performance and scalability. These developers are skilled at separating reading and writing operations, optimizing each independently, which improves system efficiency. They are also proficient in handling complex business requirements, ensuring a clear and straightforward design. Their expertise can help in avoiding common problems associated with traditional CRUD systems, such as update conflicts. Overall, a CQRS developer can provide you with a more robust, scalable, and efficient system.