Senior RHEL Administrator – TS/SCI Poly (Classified)

Assurance-Technology-Corporation-; Alexandria (VA); On-site; USD 150,000 - 210,000; Full time

Job summary

Assurance Technology Corporation is seeking a highly experienced Senior RHEL Administrator to provide enterprise-level administration, security, and support for mission-critical Linux environments in Alexandria, VA. A TS/SCI clearance and DoD cybersecurity familiarity are required.

The successful candidate will lead Linux operations, automate tasks with Ansible, and collaborate with cybersecurity teams to ensure compliance with government standards, while mentoring junior staff and supporting

Qualifications

• 15+ years of Linux system administration experience, with 10+ years on RHEL.
• Strong knowledge of clustering, storage, networking, and virtualization in RHEL environments.
• Hands-on automation experience using Ansible or similar tools.
• Deep expertise in system hardening, auditing, and compliance frameworks (DISA STIGs, NIST, RMF).
• Experience supporting classified government/defense programs.
• Excellent communication and documentation skills.

Responsibilities

• Administer, configure, secure, and optimize RHEL across physical and virtual environments.
• Perform system hardening, patch management, and vulnerability remediation per DISA STIGs, RMF, and US directives.
• Design, implement, and maintain highly available RHEL infrastructures for mission-critical workloads.
• Manage authentication and access with LDAP/Active Directory integration and Kerberos.
• Provide advanced troubleshooting and root cause analysis for complex system issues.
• Support containerization (Docker/Podman) and virtualization (VMware, KVM, Hyper-V).
• Automate tasks and workflows using Ansible, Bash, and Python.
• Collaborate with cybersecurity teams to maintain security policy compliance, audits, and incident response.
• Document system architecture, procedures, and change management processes.
• Mentor junior administrators and provide technical leadership.

Job description

Assurance Technology Corporation is seeking a highly experienced Senior RHEL Administrator to provide enterprise-level administration, security, and support for mission-critical Linux environments in Alexandria, VA. A TS/SCI clearance and DoD cybersecurity familiarity are required.

The successful candidate will lead Linux operations, automate tasks with Ansible, and collaborate with cybersecurity teams to ensure compliance with government standards, while mentoring junior staff and supporting