This deliverable presents the design of the MUSA Security Assurance Platform SaaS. It explains how the monitoring, the security enforcement and the notification mechanisms are integrated into the first version of the MUSA Security Assurance Platform SaaS. The role this platform in the MUSA flow as well as the requirements addressed by this first platform version are exposed. The deliverable also presents the interaction of the MUSA Security Assurance Platform with other MUSA components namely the SLA Repository and the MUSA Deployer and how it is integrated in the MUSA framework Kanban. A highlight on the innovation brought by the platform as well as its own security features are also detailed in this deliverable.