The GEO Knowledge Hub (GKH) is a cloud-based, open-source digital library developed by the Group on Earth Observations (GEO) Community. It supports the curation, preservation, and dissemination of Earth Observation (EO) Applications. Built on InvenioRDM, GKH provides a robust infrastructure with persistent identifiers (e.g., DOIs), digital object management, community-driven curation workflows, and advanced search capabilities.   The GEO Secretariat seeks a technically qualified company to:   Maintain and develop GKH backend and frontend systems.   Enhance and sustain cloud infrastructure and DevOps workflows.   Contribute to broader GEO infrastructure development.   Support national GKH implementations.   Deliver capacity building through webinars, technical training, and documentation.