HireFire (http://hirefire.io) is a cloud-based service that helps dynamically scale web and worker dynos in Heroku applications based on demand. This platform is designed to optimize the performance and cost-efficiency of cloud-hosted apps by automating the scaling process. With HireFire, users can set up rules based on a variety of metrics such as queue time, job queue length, and memory usage to ensure that their applications scale up during peak times and scale down during quieter periods. This functionality not only enhances application responsiveness but also helps manage costs by ensuring that resources are allocated only when necessary. HireFire is an ideal tool for developers and businesses running Heroku applications who need a flexible, automated scaling solution.