Hiring a Mithril.js developer offers several benefits. They can create lightweight, efficient, and speedy applications due to Mithril.js's small size and high performance. The framework's simplicity and flexibility allow for easier maintenance and quicker updates. It supports MVC architecture, promoting organized and structured code. Mithril.js also has robust documentation and an active community, ensuring continuous learning and support. Its modular nature allows the developer to create scalable, reusable components, enhancing the efficiency of the development process. In essence, a Mithril.js developer can help you create high-performance, maintainable web applications.