Senior Linux System Administrator - 306502

Delaware Nation Industries • Dahlgren, VA

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About The Position

Delaware Nation Industries is seeking a Senior Linux System Administrator to provide advanced systems administration and engineering support for the Air Force Joint Worldwide Intelligence Communications System/Joint Interoperability Test and Services mission. The role supports secure, resilient, and highly available Linux infrastructure across classified and unclassified environments for mission-critical operations. The administrator serves as a technical authority for Linux platforms, virtualization, automation, system security, performance, and lifecycle management. The position requires independent problem-solving, leadership of technical efforts, development of repeatable processes, and coordination with Government stakeholders and other engineering disciplines.

The role includes administering and engineering enterprise Linux systems and services; installing, configuring, hardening, patching, upgrading, and decommissioning systems; improving availability, performance, security, and capacity; supporting virtualization, storage, backup, recovery, and data-transfer services; and applying DoD cybersecurity controls. The administrator also supports integration, testing, change control, mission-readiness activities, documentation, mentoring, and coordination across technical teams. Scheduled maintenance, planned outages, incident response, and after-hours or on-call support may be required by the contract.

Requirements

• Active DoD TS/SCI security clearance.
• At least six years of professional Unix/Linux systems administration experience.
• DoD 8570/8140-compliant IAT III certification, such as CISSP, CASP+, or another current DoD-approved equivalent.
• Demonstrated experience administering enterprise Linux systems in a DoD, intelligence, classified, or similarly regulated environment.
• Strong knowledge of Linux system architecture, networking, storage, system services, access control, logging, troubleshooting, and performance tuning.
• Experience with system backup and recovery, software and patch management, security hardening, vulnerability remediation, and configuration control.
• Experience with virtualization technologies, preferably VMware vSphere and related management components.
• Proficiency with shell scripting and demonstrated ability to automate or streamline system administration tasks.
• Experience diagnosing complex technical issues, performing root-cause analysis, and communicating solutions to technical and nontechnical stakeholders.
• Strong written and verbal communication skills, ability to work independently, lead technical efforts, and collaborate across functional teams.

Nice To Haves

• Experience supporting Air Force, JWAC, JITS, Joint, intelligence, or other DoD mission environments.
• Experience with Red Hat Enterprise Linux 7/8/9 or successor supported releases, CentOS, Scientific Linux, Debian, or comparable distributions.
• Experience with Puppet Enterprise, Ansible, CloudBolt, Git, Docker, or comparable automation and DevSecOps technologies.
• Experience supporting multi-level security, cross-domain solutions, classified networks, data-transfer systems, or mission-essential communications environments.
• Experience with ACAS/Nessus, HBSS/endpoint security tools, STIG Viewer, vulnerability-management platforms, or comparable DoD cybersecurity tools.
• Experience with SAN/NAS technologies, NFS, iSCSI, RAID, LVM, XFS, ext4, ZFS, or other enterprise file systems.
• Experience with DNS, DHCP, NTP, LDAP/Active Directory integration, RADIUS, PKI, certificates, SSH, TCP/IP, and firewall-related troubleshooting.
• Experience with monitoring, logging, configuration-management, ticketing, and IT service-management platforms.
• Bachelor’s degree in information technology, computer science, cybersecurity, engineering, or a related field; equivalent experience may be considered.
• Linux, VMware, automation, security, or other relevant industry certifications.

Responsibilities

• Administer, engineer, optimize, and maintain enterprise Linux systems and services across multiple security levels and operational environments.
• Install, configure, harden, patch, upgrade, and decommission Linux operating systems, applications, services, and supporting infrastructure.
• Support Red Hat Enterprise Linux and other approved Linux distributions, including system services, package management, storage, networking, authentication, logging, and performance tuning.
• Develop repeatable procedures for system builds, provisioning, configuration management, patching, backup, recovery, restoration, and lifecycle operations.
• Analyze complex system, application, hardware, virtualization, storage, and network problems; perform root-cause analysis and implement durable corrective actions.
• Monitor system availability, resource utilization, capacity, performance, and security posture; identify risks and recommend improvements.
• Administer and troubleshoot VMware or comparable virtualized infrastructure, including virtual machines, images, templates, virtual networking, and storage dependencies.
• Develop and maintain scripts and automation using Bash, Python, Ansible, Puppet, or comparable tools.
• Support DevSecOps practices, source-code or configuration repositories, automated workflows, and controlled deployment processes when applicable.
• Apply DISA STIGs, security baselines, vulnerability-remediation procedures, and other DoD cybersecurity requirements.
• Execute or support ACAS/Nessus scans, vulnerability analysis, remediation, validation, and compliance reporting.
• Maintain secure system access, including accounts, roles, privileges, SSH, authentication services, certificates, keys, and least-privilege controls.
• Support SAN/NAS storage, NFS, iSCSI, file systems, backup infrastructure, and data-transfer services as assigned.
• Support authorized electronic and manual data transfers between network environments and troubleshoot transfer failures and integrity issues.
• Participate in system integration, testing, acceptance, change control, technical interchange meetings, exercises, and mission-readiness activities.
• Produce and maintain system documentation, architecture diagrams, standard operating procedures, configuration records, plans of action and milestones, and technical reports.
• Provide technical leadership, mentoring, knowledge transfer, and cross-training to mid-level administrators and other team members.
• Coordinate with cybersecurity, network, Windows, application, database, service desk, and Government teams to resolve escalated incidents and maintain continuity of operations.
• Participate in scheduled maintenance, planned outages, incident response, and after-hours or on-call support as required by the contract.

Benefits

• 100% coverage of employee benefit premiums, including medical (PPO or HDHP option), vision, and dental.
• 401(k) matching.
• Short- and long-term disability.
• Pet insurance.
• Professional development and education reimbursement.
• Parking and transit benefits for NY, NJ, ATL, and DC Metro areas.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed