Linux System Administrator​/Engineer

Salary Range: $ To $ Annually

Location:

Newport, RI

Clearance Requirement:

Active Secret Clearance Required (Top Secret Preferred)

Travel:

Approximately 5% CONUS travel with advance notice provided whenever possible

We are seeking a motivated and mission-focused Linux Systems Engineer / Administrator to support advanced tactical and cybersecurity-focused systems in a dynamic Department of Defense environment. The ideal candidate will possess strong Linux systems administration expertise, hands‑on cybersecurity experience, and a willingness to work across systems engineering, platform hardening, automation, and operational support activities. This role supports the engineering, security, integration, and sustainment of mission-critical systems operating in complex networked environments.

Candidates should be comfortable collaborating with cross-functional engineering teams, participating in technical reviews, and contributing to secure systems modernization efforts.

• Administer, maintain, and secure Linux-based systems in operational and development environments
• Implement and maintain Linux system hardening in accordance with DISA STIGs and cybersecurity best practices
• Manage firewall configurations, networking services, privilege management, and access controls
• Support systems engineering efforts by evaluating and implementing engineering changes and cybersecurity enhancements
• Develop and maintain shell scripts and Python-based automation solutions to improve operational efficiency and system reliability
• Assist with deployment and sustainment of containerized applications using Kubernetes or similar orchestration platforms
• Participate in CI/CD pipeline development and maintenance including automated testing, SAST/DAST integration, and deployment workflows
• Support cybersecurity assessments, vulnerability remediation activities, and RED TEAM exercises
• Analyze penetration testing results and recommend mitigation or remediation strategies
• Collaborate with engineering, cybersecurity, and operations teams during trade studies, integration efforts, and technical reviews
• Provide on-site technical support during testing events, system installations, and fleet or vendor visits as required
• Maintain documentation related to system configurations, engineering changes, security controls, and operational procedures
• Develop and maintain technical documentation including system procedures, engineering artifacts, implementation plans, test plans, and test reports
• Support system integration and Test & Evaluation (T&E) activities through test planning, execution support, documentation, and reporting
• Coordinate with engineering and cybersecurity teams to document system changes, validation activities, and remediation efforts

Significant experience with Linux systems administration in enterprise or mission-critical environments

• Strong understanding of:
• Privilege and identity management
• System hardening and STIG compliance
• Bash shell scripting
• Python programming
• Familiarity with CI/CD pipelines and Dev Sec Ops  concepts including:
• Automated tooling
• Unit testing
• Static and dynamic application security testing (SAST/DAST)
• Experience working in containerized environments using Kubernetes or equivalent orchestration tools
• Ability to troubleshoot complex Linux systems and networking issues
• Strong technical writing and verbal communication skills
• Active Secret Security Clearance or eligibility for reinstatement
• Experience managing and maintaining virtualized environments including virtual machine (VM) creation, configuration, administration, and lifecycle management

• File system administration and manipulation
• Encryption and key management
• ACL and IMA labeling
• Experience…