A Demandware developer specializes in using Salesforce Commerce Cloud (formerly Demandware) to design, develop, and implement ecommerce solutions. They are responsible for creating customized online stores, integrating third-party applications, and ensuring the platform's security. They troubleshoot technical issues, optimize website performance for better user experience, and maintain up-to-date knowledge of new features and improvements. They also collaborate with other team members to understand business requirements, translate them into technical specifications, and conduct testing to ensure the functionality and efficiency of the platform. Additionally, they may provide technical support and training to users.