UNICHE D4.3 System Architecture Document

This deliverable presents the system architecture of the UNICHE platform. It translates the user requirements and functional specifications collected in D4.1, the pilot-based use cases and ECCCH integration strategy defined in D4.2, and the technical constraints into a structured modular architecture ready to guide implementation. The architecture defines UNICHE as an integrated but distributed ecosystem composed of authoring tools, visitor-facing experience applications, shared platform services, AI-enabled components, content and asset management services, analytics components, and ECCCH integration mechanisms. This design responds directly to the empirical evidence collected in the project so far. The proposed architecture is modular: each tool keeps the internal data model and technology stack required by its domain, while shared contracts for identity, asset import, runtime content delivery, logging, AI service access, and API routing make the whole platform interoperable. This approach avoids forcing heterogeneous tools into a single implementation model, while still creating the common operational layer needed for pilots, integration, ECCCH alignment, and future exploitation. The document specifies the core architectural components, the system-level functional and non-functional specifications, the logical and physical architecture, the main data flows, the implementation roadmap, and the annexed specification lists needed by the development teams. It also records the open architectural decisions that require partner confirmation, especially around repository implementation scope and operations, deployment topology, ECCCH federation details, multi-tenancy, analytics integration, and the final technology choices for observability and AI infrastructure. The deliverable is the currently submitted version – pending formal acceptance.