Linux Systems Administrator

We are seeking a Linux Systems Administrator to support the development and implementation of a CMMC-compliant infrastructure across our programs. The ideal candidate will have strong experience administering Red Hat Enterprise Linux (RHEL) (including Rocky Linux) and/or Ubuntu, with an emphasis on system hardening, security compliance, and automation. A solid understanding of NIST 800-171 and its application across Linux environments is essential.

This position plays a key role in ensuring that systems are compliant with security standards while remaining efficient and user-friendly for developers and system users. The role requires minimal supervision and will involve working closely with internal stakeholders across cybersecurity, IT, and development teams.

• Lead the configuration, administration, and hardening of RHEL, Rocky Linux, and Ubuntu environments in support of CMMC 2.0 and NIST 800-171 compliance.
• Perform complex software installations, upgrades, and patch management in accordance with IT policies and cybersecurity requirements.
• Develop and maintain standard operating procedures (SOPs) and technical documentation for Linux systems.
• Monitor system performance and conduct tuning and optimization to maintain high availability and efficiency.
• Evaluate, implement, and manage security controls, including SELinux, LDAP integration, and multi-factor authentication (MFA) solutions.
• Work closely with developers and end-users to ensure that security controls are non-disruptive to operational workflows.
• Conduct hardware and software audits of systems to verify compliance with internal policies and external regulatory requirements.
• Participate in the modernization and automation of the Linux server infrastructure using tools such as Ansible.
• Implement and support identity and access management solutions including FreeIPA, SSSD/Kerberos, and LDAP authentication across Linux systems.
• Collaborate with cross-functional teams on assessment readiness for CMMC 2.0, DFARS, and other regulatory frameworks.

• Bachelor's degree in Computer Science, IT, or a related field and 5+ years of Linux system administration experience; or a Master's degree with 3+ years; or equivalent work experience.
• Strong hands-on experience with:
  • Red Hat Enterprise Linux (RHEL)
  • Ubuntu/Linux system hardening (CIS Benchmarks preferred)
  • SELinux, LDAP authentication, and Red Hat Ansible
• Knowledge of NIST 800-171 controls and their implementation in Linux environments.
• Familiarity with automation tools and scripting languages for infrastructure management.
• Excellent troubleshooting, communication, and documentation skills.

• Experience with:
  • CMMC 2.0 readiness assessments
  • Active Directory (AD) integration
  • FreeIPA installation and configuration
  • SSSD/Kerberos for identity integration
  • MFA implementation on Linux systems
• Familiarity with DFARS and U.S. government cybersecurity regulations.
• Prior experience in a DoD, defense contractor, or regulated IT environment.