Hiring a Heroku developer can streamline your application development process, as they are proficient in this cloud-based, platform-as-a-service (PaaS). They can help in building, running, and managing applications entirely within virtual environments, saving the hassle of hardware or infrastructure management. Their expertise allows quick deployment, scaling, and management of apps, reducing the time-to-market. They can also handle data management, system integration, and troubleshooting efficiently. Hence, a Heroku developer can be a valuable addition to your team, allowing you to focus more on your business's core competencies.