Electronic displays and digital signage have become ubiquitous over the years, and we view or interact with them on a daily basis. With the emergence of cloud computing and web technologies, electronic displays can be connected directly to cloud services from which they retrieve both configuration commands and HTML5 content. Cloud-based management makes it easy to update the displays, and the use of standard web languages enables rapid development of new dynamic applications. However, the remote management aspects and scalability from small personal deployments upwards have received limited attention in the literature. To this regard, our major contributions are the collection of requirements from actual digital signage deployments and the design of a system that encompasses all the different phases involved in the related lifecycle. We specifically design, implement and evaluate a flexible and user-friendly digital signage management system.