An Alloy developer designs and implements applications using the Alloy framework, a development tool for Appcelerator's Titanium platform. They code, test, debug, and maintain these applications, ensuring optimal performance and user experience. They integrate APIs, services, and third-party modules, while adhering to best practices for secure, efficient and reusable code. They also collaborate with other team members, handle version control systems, and resolve any software-related issues. Furthermore, they're responsible for keeping up with the latest technology trends and improvements in the Alloy framework, and applying this knowledge to improve or update existing applications.