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The Senior Linux Systems Administrator is responsible for designing, deploying, securing, automating, and maintaining enterprise Linux server infrastructure and developer workstation fleets across on-premises and multi‑cloud environments.

This role serves as the subject matter expert for enterprise Linux distributions ( Oracle Linux, Red Hat Enterprise Linux, Ubuntu ), configuration management, and centralized orchestration. A primary focus includes managing and scaling Canonical Landscape to administer hundreds of Ubuntu developer desktops within a strict CMMC 2.0 Level 2 / NIST SP 800-171 compliant environment. The ideal candidate brings deep expertise in Linux PAM architecture, enterprise MFA integrations, infrastructure-as-code automation, and defense‑in‑depth security hardening.

• Enterprise Linux Server Administration: Design, build, configure, and maintain mission‑critical Linux servers across on‑prem (VMware vSphere) and cloud environments (OCI, AWS, Azure), supporting engineering workloads, database platforms, and custom development pipelines.
• Developer Fleet Management: Architect, deploy, and administer Canonical Landscape to manage configuration profiles, package repositories, compliance policies, and automated patch management for hundreds of Ubuntu developer endpoints.
• Identity & Access Management (MFA/PAM): Implement and enforce robust authentication and authorization frameworks, including smart card/FIPS‑compliant MFA at desktop and SSH login, PAM module engineering, SSSD/FreeIPA integration, Active Directory/LDAP bridging, and centralized sudoers delegation.
• CMMC L2 & Security Compliance: Harden Linux servers and workstations to NIST SP 800-171, DISA STIG, and CIS Level 2 benchmarks. Implement SELinux/AppArmor enforcement, auditd daemon logging, file integrity monitoring (FIM), and SIEM log forwarding.
• Automation & Configuration Management: Develop and maintain Infrastructure‑as‑Code (IaC) and configuration baselines using Ansible, Terraform, Puppet/Chef, and advanced Bash/Python scripting.
• Storage & Virtualization: Configure and troubleshoot enterprise SAN/NAS storage, iSCSI/NFS mounts, multipathing, LVM volumes, and VMware ESXi/vCenter virtualization for Linux guests.
• Engineering Tools & Service Desk Escalation: Serve as Tier 3 escalation support for engineering applications, toolchains, build environments, license managers (FlexLM), and core network/directory services (DNS, DHCP, LDAP, Kerberos, NTP).
• High Availability & Disaster Recovery: Design robust backup and recovery workflows, test system failover procedures, monitor system health/telemetry (Prometheus, Grafana, Zabbix), and resolve complex performance bottlenecks.

• Education: Bachelor’s degree in Computer Science, Information Technology, Cybersecurity, or equivalent combination of education, technical training, and experience.
• Experience: Minimum of 8–12 years of total IT infrastructure experience, with at least 6+ years focused on enterprise Linux systems administration.
• Distribution Mastery: Deep, hands‑on administration of Oracle Linux (UEK), Red Hat Enterprise Linux (RHEL), and Ubuntu Server/Desktop .
• Fleet Management: Proven experience managing Linux endpoints at scale using Canonical Landscape , Red Hat Satellite, or Foreman.
• Authentication & MFA: Demonstrated experience implementing Linux desktop and SSH Multi‑Factor Authentication (YubiKey, PKI/Smartcard, Duo, or Okta PAM integration).
• Compliance & Hardening: Direct experience hardening Linux environments to NIST SP 800-171, CMMC Level 2, or DISA STIG requirements.
• Automation: Strong proficiency in Ansible and scripting with Bash or Python .
• Virtualization & Storage: Solid experience with VMware vSphere/ESXi and enterprise storage management (LVM, NFS, iSCSI, SAN).
• Security Clearance / Export Control: Must be a U.S. Person (U.S. Citizen or Lawful Permanent Resident) due to compliance with ITAR/EAR regulations; ability to obtain and maintain a DoD Security Clearance if required.