Senior System & Information Security Administrator

We are looking for a hands-on Senior System & Information Security Administrator to maintain and support our IT infrastructure and security environment. In this role, you will be responsible for the day-to-day administration, maintenance, and security of the organization’s IT systems, ensuring system stability, availability, and protection. Responsibilities: System Administration - Manage and maintain servers (On-prem/ Azure), Active Directory (Entra ID), user accounts, and monitoring systems IT Infrastructure & Storage - Maintain networks, hardware, and storage systems to ensure stable and efficient operations Technical Support - Provide high-level technical support to end users and resolve infrastructure related issues Information Security - Maintain firewalls, endpoint protection, and access control; enforce security policies to ensure system integrity Backup & DB Maintenance - Manage backup processes, disaster recovery (DR), and routine MS-SQL Server maintenance Vendor Coordination - Professional management of external IT and security vendors when required. • 7+ years of proven experience as a System Administrator - Mandatory. • Strong knowledge of Windows Servers, Linux Servers, Networking, and IT infrastructure. • Experience with Azure and Microsoft 365 (M365) administration. • Experience with virtualization - mainly Proxmox • Deep understanding of cyber security • English – very high proficiency.