DV Cleared Linux Systems Administrator

Location: On-site (Secure Facility - London
Clearance: Active UK Developed Vetting (DV) required
Employment Type: Full-Time
Sector: Secure / Defence / Government

About the Role

We are seeking an experienced DV Cleared Linux Systems Administrator to join our secure operations team. Working within a high-security environment, you will be responsible for maintaining, supporting, and optimising Linux-based systems that underpin mission-critical services for government and defence-sector customers.

This position is ideal for a highly skilled engineer who thrives in a secure, fast-paced environment and takes pride in delivering reliable, stable, and secure infrastructure solutions.

Key Responsibilities

• Administer, configure, and maintain Linux servers (RHEL, CentOS, Ubuntu, or similar) in a secure, multi-system environment.
• Monitor system performance, troubleshoot issues, and implement improvements to ensure maximum uptime and efficiency.
• Perform patching, updates, and security hardening in accordance with strict governance and compliance requirements.
• Support secure networks, storage solutions, and virtualised environments (VMware, KVM, or Hyper-V).
• Manage user accounts, permissions, and access controls following least-privilege principles.
• Produce and maintain system documentation, runbooks, and operational procedures.
• Work closely with security teams to ensure systems remain compliant with internal and external standards.
• Support incident response, root-cause analysis, and service restoration activities.
• Participate in on-call or out-of-hours support as required within the secure environment.

Skills & Experience

• Active DV clearance (must be currently held and transferable).
• Strong hands-on experience with Linux administration across production or secure environments.
• Knowledge of shell scripting (Bash, Python, or similar).
• Experience with secure configuration, system hardening, and compliance frameworks.
• Familiarity with configuration management or automation tools (e.g., Ansible, Puppet).
• Good understanding of networking fundamentals (TCP/IP, DNS, DHCP, firewalls).
• Experience with monitoring tools (Nagios, Zabbix, Prometheus, or equivalent).
• Strong problem-solving skills with the ability to work independently in a restricted environment.
• Excellent documentation and communication skills.

Desirable (Not Essential)

• Exposure to defence, government, or high-security environments.
• Experience with DevOps tooling (Git, CI/CD, containers, Docker/Kubernetes).
• Knowledge of storage technologies (SAN/NAS).
• Certifications such as RHCSA/RHCE, Linux+, or security-related qualifications.

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