Senior Linux Systems Engineer - DoD/TS/SCI

Delaware Nation Industries; Dahlgren (VA); On-site; USD 120,000 - 150,000; Full time

Job summary

Delaware Nation Industries seeks a Senior Linux System Administrator to provide advanced administration and engineering support for mission-critical Linux infrastructure across classified and unclassified environments in Dahlgren, VA. You will lead technical efforts, implement repeatable processes, and coordinate with Government stakeholders to ensure secure, resilient operations.

The role requires TS/SCI clearance, 6+ years of Unix/Linux experience, and DoD 8570 IAT III certification.

Qualifications

• 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 (e.g., CISSP/CASP+).
• Experience administering enterprise Linux in DoD/intelligence environments.

Responsibilities

• Administer, engineer, and maintain enterprise Linux systems across security levels.
• Support RHEL and related services, including patching, hardening, and performance tuning.
• Design repeatable procedures for builds, provisioning, and lifecycle operations.
• Lead root-cause analysis for complex system issues and implement durable fixes.
• Monitor availability, capacity, and security posture; mitigate risks.
• Develop automation with Bash, Python, Ansible, or Puppet to improve consistency.
• Support DevSecOps workflows and controlled deployments.
• Apply DISA STIGs and DoD cybersecurity requirements.
• Execute vulnerability scans and remediation reporting.
• Maintain secure access control, certificates, and SSH configurations.
• Support SAN/NAS, NFS, and data-transfer services as assigned.
• Participate in testing, change control, and mission-readiness activities.
• Produce system documentation and architectural diagrams.
• Provide technical leadership and mentoring to junior staff.
• Coordinate with cross-team stakeholders to resolve incidents.

Skills

Linux

VMware vSphere

Scripting (Bash/Python)

DevSecOps tooling

Security hardening

DoD 8570/8140 IAT III

Communication

Education

Bachelor's degree

Tools

Puppet Enterprise

Ansible

CloudBolt

Git

Docker

Job description

Delaware Nation Industries seeks a Senior Linux System Administrator to provide advanced administration and engineering support for mission-critical Linux infrastructure across classified and unclassified environments in Dahlgren, VA. You will lead technical efforts, implement repeatable processes, and coordinate with Government stakeholders to ensure secure, resilient operations.

The role requires TS/SCI clearance, 6+ years of Unix/Linux experience, and DoD 8570 IAT III certification.