IS/IT SME III Linux System Admin

We are seeking a highly skilled and experienced IS/IT Subject Matter Expert (SME) III with a primary focus on Linux System Administration, complemented by strong proficiency in Windows Server environments. This role demands a deep understanding of both operating systems, their interoperability, and the strategic application of IT solutions to meet complex organizational and mission requirements. The successful candidate will serve as a top-tier technical resource, responsible for the design, implementation, maintenance, and optimization of critical IT infrastructure, ensuring high availability, security, and performance across hybrid environments., Linux System Administration:

• Design, deploy, configure, and maintain complex Linux server environments (e.g., RHEL, CentOS, Ubuntu, Debian) in physical, virtual, and cloud infrastructures.
• Perform advanced troubleshooting, performance tuning, and capacity planning for Linux systems.
• Manage user accounts, permissions, file systems, and storage solutions.
• Implement and manage system monitoring, logging, and alerting solutions.
• Develop and maintain automation scripts (Bash, Python, Ansible, Puppet, Chef) for system provisioning, configuration, and task automation.

Windows Interoperability & Administration:

• Administer and support Windows Server environments, including Active Directory, DNS, DHCP, and Group Policy.
• Ensure seamless interoperability and integration between Linux and Windows systems (e.g., authentication, file sharing, networking).
• Provide expertise in troubleshooting issues that span both Linux and Windows platforms.

Cybersecurity & Compliance:

• Implement and enforce security best practices, including system hardening (STIGs), vulnerability management (ACAS/Nessus), and patch management.
• Conduct security audits and ensure compliance with relevant DoD, industry, and organizational security policies.
• Participate in incident response activities, providing expert analysis and remediation support.

Infrastructure & Operations:

• Manage virtualization platforms (e.g., VMware, KVM) and containerization technologies (e.g., Docker, Kubernetes) on Linux.
• Support cloud-based Linux instances (e.g., AWS EC2, Azure VMs) and related cloud services.
• Collaborate with network, storage, and application teams to ensure optimal system performance and reliability.
• Develop and maintain comprehensive documentation for system configurations, procedures, and architectural designs.

Mentorship & Leadership:

• Serve as a Subject Matter Expert, providing technical guidance, training, and mentorship to junior administrators and cross-functional teams.
• Lead complex projects and initiatives related to Linux and Windows infrastructure.
• Contribute to strategic planning and architectural decisions for IT systems.

Schedule: 8-hour shift Monday to Friday within Core Hours of 07:00 - 17:00

• Active DoD Top Secret/ SCI Clearance (Minimum)
• Bachelor's Degree in Computer Science, Cybersecurity, Information Technology, or a related field. (Equivalent experience may be considered in lieu of a degree).

Current DoDD-8140/8570 certification (Required)

• CompTIA Security+ CE
• Relevant Linux certifications (e.g., RHCE, LPIC-2/3)
• Relevant Windows Server certifications (e.g., MCSA, MCSE).
• DoD 8570.01-M IAT Level II or higher (e.g., CySA+, CASP+).

One (1) or more of the following Operating System Certifications (Minimum)

• Microsoft Server Certification
• Red Hat Enterprise Linux (RHEL)
• CompTIA Linux+

5+ years of relevant experience (Minimum), Minimum of 5 years of progressive experience focused on advanced Linux system administration and 2+ years of significant Windows Server administration experience.

• Expert-level proficiency in multiple Linux distributions (e.g., RHEL/CentOS, Ubuntu, Debian).
• Strong experience with Windows Server administration (2016/2019/2022), Active Directory, and related services.
• Proven experience with scripting and automation tools (Bash, Python, PowerShell, Ansible).
• Extensive knowledge of networking concepts (TCP/IP, DNS, DHCP, VPN, routing, firewalls).
• Experience with virtualization technologies (e.g., VMware vSphere, KVM).
• Familiarity with cloud platforms (AWS, Azure, GCP) and managing Linux instances within them.
• Demonstrated understanding of cybersecurity principles, system hardening (STIGs), and vulnerability management (ACAS/Nessus)

Having following skills is a PLUS:

• Experience working with the Joint Staff (JS) and COCOMs.
• Master's degree in a relevant technical field.
• Experience with containerization technologies (Docker, Kubernetes).
• Familiarity with DevOps practices and CI/CD pipelines.
• Experience with enterprise monitoring solutions (e.g., Splunk, Nagios, Prometheus).
• Knowledge of storage area networks (SAN) and network-attached storage (NAS) in Linux environments., * Which operating system certification do you have (RHEL, CompTIA Linux+, Microsoft Server Certification)

Experience:

• Linux system administration: 5 years (Required)

License/Certification:

• CompTIA Security+ CE (Required)
• DODD-8140/8570 certification (Preferred)

Pulled from the full job description

• Tuition reimbursement
• 401(k)
• Health insurance
• 401(k) matching
• Paid time off
• Vision insurance
• Dental insurance, * 401(k)
• 401(k) matching
• Dental insurance
• Health insurance
• Life insurance
• Paid time off
• Tuition reimbursement
• Vision insurance