Xen Orchestra is a production-grade virtualization management platform for XenServer/XCP-ng hypervisors. It provides a comprehensive suite of tools for managing VMs, hosts, storage, networks, and users, with a strong emphasis on backup, replication, and disaster recovery. The system is architected as a monorepo containing multiple frontends (a legacy React UI and a modern Vue 3 UI), a REST API, CLI tools, a backup proxy, and a rich set of internal libraries (`@vates/*`, `@xen-orchestra/*`). In production, Xen Orchestra acts as the central control plane for virtualized infrastructure. It communicates with hypervisors via the Xen API (XML-RPC), manages storage backends (NFS, S3, SMB, Azure), and orchestrates complex backup workflows (full, incremental, mirrored, metadata). It also handles V2V migration from VMware, SDN controller integration, and performance monitoring. The codebase demonstrates exceptionally high craftsmanship in its core libraries. Components like the iSCSI initiator (`@vates/iscsi`), the composable disk transform library (`@xen-orchestra/disk-transform`), the FAT filesystem reader (`@vates/fatfs`), and the logging framework (`@xen-orchestra/log`) are standalone, well-tested, and exhibit non-obvious engineering skill. These are safely reusable in other Node.js projects. However, the project suffers from significant technical drift. It relies on EOL Node.js 14 and the deprecated Yarn 1 package manager. The presence of a legacy React UI alongside the new Vue 3 UI indicates a long-running migration. Despite this, the core architecture and the quality of the internal libraries make it a valuable reference for building complex, protocol-heavy infrastructure software.