LUMEN is a 36-month EOSC project (2025–2027) building a federated ecosystem to improve interdisciplinary discovery and reuse of research outputs across four domains: Mathematics, SSH, Earth System Sciences, and Molecular Dynamics. We will present LUMEN’s data-mesh-inspired approach combining autonomous community services with shared discovery capabilities (white-label platforms, metasearch, AI-enhanced tools, LUMIS for semantic artefacts, a software catalogue, and metrics), and outline the LUMEN–EVERSE alignment on research software quality and sustainability by enriching the LUMEN catalogue with quality indicators, exploring RSQKit-based assessment, and promoting interoperable standards (e.g., CodeMeta and FAIR software indicators) to enable trusted cross-catalogue discovery in EOSC.