Senior Linux System Administrator - 306502

DNI (Delaware Nation Industries); Dahlgren (VA); On-site; USD 120,000 - 125,000; Full time

Benefits offered by this job

Medical premiums paid

401K match

Disability insurance

Pet Insurance

Education reimbursement

Parking & transit

Job summary

Delaware Nation Industries seeks a Senior Linux System Administrator to oversee advanced Linux infrastructure across classified and unclassified DoD environments. You will be the technical authority on Linux, virtualization, security, and lifecycle management, leading efforts and coordinating with Government stakeholders.

The role requires independent problem solving, strong scripting/automation capabilities, and mentoring mid-level staff while ensuring mission-critical operations remain secure

Qualifications

• Active DoD TS/SCI security clearance
• 6+ years Unix/Linux admin experience
• DoD 8570/8140 IAT III cert (CISSP/CASP+ or equivalent)
• Experience administering enterprise Linux in DoD/regluated env
• Strong Linux architecture, networking, storage
• Automation via Bash/Python/Ansible/Puppet

Responsibilities

• Administer, engineer, and maintain enterprise Linux systems across security levels
• Install, patch, harden, upgrade Linux OS and services
• Support Red Hat Enterprise Linux and related distributions
• Develop repeatable system-build and patching procedures
• Analyze complex system and network issues and root-cause分析
• Monitor availability, security posture, and performance
• Administer VMware and virtualized infrastructure
• Develop automation scripts to improve efficiency
• Support DevSecOps and controlled deployments
• Apply DISA STIGs and vulnerability remediation
• Execute ACAS/Nessus scans and compliance reporting
• Maintain secure access and certificates
• Support storage, backups, and data transfers
• Coordinate with teams for incident resolution
• Produce system documentation and diagrams
• Provide technical leadership and mentoring
• Coordinate cross-team resolution of escalated incidents
• Participate in maintenance and on-call support

Skills

Unix/Linux

Security clearance

Shell scripting

VMware

DoD cybersecurity

Education

Bachelor's degree in IT/CS/Engineering

Tools

Ansible

Puppet

Git

Docker

VMware vSphere

Job description

Delaware Nation Industries is seeking a Linux System Administrator - Senior to provide advanced systems administration and engineering support for the Air Force Joint Worldwide Intelligence Communications System/Joint Interoperability Test and Services mission. This position will help maintain secure, resilient, and highly available Linux infrastructure across classified and unclassified environments supporting mission-critical operations.

The Senior Linux System Administrator will serve as a technical authority for Linux platforms, virtualization, automation, system security, performance, and lifecycle management. The position requires the ability to independently solve complex problems, lead technical efforts, develop repeatable processes, and coordinate with Government stakeholders and other engineering disciplines.

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
• Design and implement 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; conduct root-cause analysis and implement durable corrective actions
• Monitor system availability, resource utilization, capacity, performance, and security posture; identify risks and recommend improvements before they affect mission operations
• 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 to improve consistency, reduce manual effort, and support troubleshooting
• Support DevSecOps practices, source-code or configuration repositories, automated workflows, and controlled deployment processes when applicable to the environment
• Apply DISA STIGs, security baselines, vulnerability-remediation procedures, and other DoD cybersecurity requirements to Linux systems and applications
• 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, integrity issues, and related operational problems
• 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

Requirements

• Active DoD TS/SCI security clearance
• At least six (6) 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 and the ability to work independently, lead technical efforts, and collaborate across functional teams

Preferred Qualifications

• 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

Benefits

Benefits Include:

• Covers 100% of employee benefit premiums, including Medical (PPO or HDHP Option), Vision, Dental
• Matching 401K
• Short- and Long-Term Disability
• Pet Insurance
• Professional Development/Education Reimbursement
• Parking and Transit Benefits for NY, NJ, ATL, and DC Metro areas

Other Duties: Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.

Salary Compensation: $120,000-$125,000

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans