The ni4os-europe project aims to enhance the European Open Science Cloud (EOSC) by supporting the development and integration of national Open Science Cloud initiatives across 15 member states. It focuses on building infrastructure, ensuring inclusivity, and providing technical and policy support for service providers to comply with EOSC governance and FAIR principles. Key objectives include fostering collaboration, harmonizing best practices, and engaging communities to promote the uptake of open science resources and services.