This deliverable documents the design principles and software architecture characterising the release and development of the Blue-Cloud Virtual Research Environment (VRE) common services, namely the analytics computing framework, the catalogue framework, the storage framework and the enabling framework components. This report is the second of two versions, each one describing the design associated with a specific version of the VRE. This deliverable D5.4 provides the updated and extended version of D5.1 "Blue-Cloud VRE Common Services 1st Release" [8]. The document presents the current state of the Blue-Cloud Virtual Research Environment (VRE) common services, detailing both the new components introduced in the period M13 to M36 and the enhancements applied to the existing ones to ensure compliance with interoperability, scalability, and robustness requirements. Overall, deliverable D5.4 provides a consolidated, fully up-to-date view of the Blue-Cloud VRE common services architecture, covering functional capabilities, API exposure, deployment configuration, and integration status as of the end of the second reporting period. The deliverable consists of six sections. Section 1 briefly introduces the role of this deliverable in the development and delivery of the Blue-Cloud VRE common services. Section 2 describes the Blue-Cloud VRE logical architecture of the common services and how they relate to the other services available in the VRE. Section 3, 4, 5 and 6 document the release of the Blue-Cloud VRE common services available at M36, reporting the design principles and reference software architecture of the released solutions. Specifically, Section 3 describes the analytics computing framework which includes the Analytics Engine, Galaxy workflows, the RStudio and the Jupyter Notebooks via JupyterHub. Section 4 presents the VRE Catalogue framework and its components, and Section 5 reports on the Storage framework. Finally, Section 6 concludes the report by illustrating the services composing the Enabling framework, which is used as a common ground for all the above-mentioned frameworks.