Hiring a developer is beneficial for designing large-scale, distributed, and transactional applications. They bring expertise in a robust platform, offering solutions for scalability, reliability, and efficient data management. Their proficiency in Java's security features ensures secure software. They are skilled in working with various databases, servers, and development tools. These developers can easily integrate with existing systems and services, offering flexibility. They also contribute to reduced development time due to the reusable code feature of Java. Thus, hiring a developer can greatly enhance your application's performance and security.