We''re looking for an experienced Linux Infrastructure Engineer with active DV clearance to support a highly secure, business-critical infrastructure environment within a major public-sector programme. You''ll join an enterprise infrastructure team responsible for the stability, security and performance of a complex on-premises Linux estate. This is a hands-on engineering role combining advanced second- and third-line support with infrastructure improvement and project delivery. You''ll take ownership of complex technical issues, support critical Linux services and contribute to platform upgrades, vulnerability remediation, resilience and service improvement within a tightly controlled environment. Key Responsibilities Provide advanced 2nd/3rd-line support for enterprise Linux infrastructure, taking ownership of complex incidents through to resolution. Administer, build, configure, patch and upgrade Red Hat Enterprise Linux (RHEL) and Ubuntu Server environments. Troubleshoot operating-system, Kernel, performance, networking, storage and file-system issues. Support highly available and clustered Linux services, including Veritas Cluster Server (VCS) and Red Hat Resilient Storage/GFS2. Manage enterprise storage and volume technologies, including VXFS, ZFS, XFS, EXT3/4, UFS, SVM, VXVM and LVM. Support storage replication, disaster recovery and resilience activities, including SRDF and STAR. Maintain system security, access controls, audit logging and compliance ..... full job details .....