Linux Systems Administrator

Peraton is seeking a Linux Systems Administrator with an active TS/SAP clearance to join our team supporting mission-critical operations. The ideal candidate will manage maintain and enhance secure Linux-based environments while ensuring uptime and performance for essential applications. The candidate will be working closely with IA team supporting Continuous Monitoring tasks enforcing cybersecurity compliance and addressing vulnerabilities identified through Nessus scans. This role involves configuring and maintaining Linux servers and desktops implementing security mitigations and ensuring compliance with government standards.

Key Responsibilities:

• Continuous Monitoring & Vulnerability Mitigation:
  • Perform continuous monitoring of systems using vulnerability scanning tools likeTenable Nessus.
  • Identify and analyze vulnerabilities from weekly and monthly scans.
  • Mitigate identified vulnerabilities by reconfiguring Linux servers and desktops or applying patches security updates and configuration changes.
  • Track document and report vulnerability remediation activities to ensure ongoing compliance with Risk Management Framework (RMF) or Intelligence Community standards.
• Linux System Administration:
  • Deploy Configure maintain and secureLinux-based servers and desktops (RHEL CentOS Ubuntu).
  • Configure networking services such as DNS DHCP and NFS.
  • Manage user accounts permissions and authentication in compliance with security policies.
  • Harden systems using existing guidelines such as Security Technical Implementation Guides (STIGs) or custom configurations.
  • Apply and test kernel updates package upgrades and security patches in production and development environments.
  • Monitor Linux systems for performance security and availability resolving issues proactively.
  • Implement and maintain system backup and disaster recovery procedures.
  • Collaborate with cross-functional teams to support system integration and deployment efforts.
  • Stay current with technological advancements and recommend improvements as necessary.

• Automation and Process Improvement:
  • Develop and maintain shell scripts or automation tools (Bash Python etc.) to streamline administrative and cybersecurity tasks.
  • Implement and manage automated patching and vulnerability remediation via tools likeAnsiblePuppet orChef.

• Documentation & Auditing:
  • Maintain detailed system configuration documentation.
  • Document vulnerability findings mitigations and resolutions in tickets or compliance reports.
  • Support security audits by providing technical information and collaborating with the Information Assurance teams.
• Collaboration:
  • Work closely with the Information Assurance (IA) and Cybersecurity teams to ensure systems meet security requirements.
  • Collaborate with network administrators and application teams to integrate Linux environments supporting enterprise solutions.

Required Qualifications:

• Active TS w/ SCI eligibility
• 5 years with BS/BA or 3 years with MS/MA degree in Computer Science Information Technology or related field.
• 3-5 years of experience managing Linux environments in classified secure settings.
• Proficiency with Linux operating systems (Ubuntu RedHat) package management and scripting skills in Bash Python or similar languages for automation.
• Understanding of system security requirements in DoD or Intelligence domains (e.g. STIGs RMF).

Preferred Qualifications:

• Experience with virtualization technologies (KVM Red Hat Proxmox).
• Familiarity with configuration management tools (e.g. Ansible Puppet Chef).
• Knowledge of containerization (Docker Kubernetes).
• Certifications: Red Hat Certified System Administrator (RHCSA) ITIL or equivalent.

Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy. As the worlds leading mission capability integrator and transformative enterprise IT provider we deliver trusted highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land sea space air and cyberspace. The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day our employees do the cant be done by solving the most daunting challenges facing our customers. Visit to learn how were keeping people around the world safe and secure.