Hiring a Hogan.js developer can significantly improve your web application's performance. Hogan.js is a fast, effective, and flexible templating engine developed by Twitter. It allows for the creation of reusable HTML templates, which can significantly reduce development time and ensure consistent design. It's compatible with both front-end and back-end development, enhancing versatility. The developer's expertise in Hogan.js can help in creating efficient, scalable, and maintainable code, leading to a robust, user-friendly web application. This can potentially enhance user experience, improve engagement, and increase overall business productivity.