Systems and Network Administrator

Job Description

Job Description

IERUS specializes in electromagnetic spectrum technologies and design for RF, IR, and optical applications. IERUS also supports customers with a diverse set of competencies including software development, air and missile defense, and systems engineering. IERUS develops value for our defense and commercial customers through accelerations of the technology life cycle: identifying, creating, transitioning, and producing technologies with integrity of purpose and product.

IERUS is looking for bright, talented, motivated, and dedicated employees in the engineering field, especially those with electromagnetics experience. IERUS offers competitive compensation packages, retirement options, and benefits packages. To learn more, please visit

IERUS Technologies is seeking a Systems Administrator with strong networking experience to support and help maintain an enterprise environment operating under CMMC compliance requirements. This role blends traditional systems administration with hands-on networking responsibilities, supporting infrastructure that includes Cisco networking, Palo Alto security appliances, Microsoft 365 services, and enterprise IT management platforms.

The ideal candidate has 5–8 years of IT experience in the defense industry, including at least 3 years working directly with networking technologies.

Primary Responsibilities:

• Administer and maintain the organization’s CUI network and overall systems infrastructure in the interest of maintaining compliance with applicable federal regulations and cybersecurity frameworks.
• Configures, monitors, and troubleshoots Cisco switches, routers, and wireless equipment as part of day-to-day operations.
• Administers Cisco ISE to manage network access, authentication, and policy enforcement.
• Manages Palo Alto firewalls, including maintaining security rules, configuring VPNs, and monitoring for potential threats.
• Supports Microsoft 365 services such as Exchange Online, SharePoint, Teams, and identity management.
• Manages Active Directory, Group Policy, DNS, DHCP, and other authentication systems.
• Supports Atlassian tools like Jira and Confluence used for ticketing, documentation, and internal workflows.
• Respond to urgent network or infrastructure incidents and support after-hours troubleshooting when required.
• Manages and configures both Windows 11 and RHEL operating systems.
• Monitors network performance and troubleshoots connectivity issues across LAN, WAN, and VPN connection.
• Assists with endpoint management, patching, and configuration compliance for both Windows and Linux systems.
• Effectuates CMMC requirements, including documentation, implementation of security controls, and audit preparation.
• Works closely with the team, other business operations members, and engineers to keep systems running securely and reliably.

Required Qualifications

• 5–8 years of IT experience
• Minimum of 3 years networking experience
• Current CompTIA Security+ certification
• Must be a U.S. Citizen with an active DoD Secret Clearance
• Strong experience with Cisco networking technologies (switching, routing, VLANs, ACLs, etc.)
• Experience administering Palo Alto firewalls and security policies
• Experience supporting Microsoft 365 environments
• Strong knowledge of Active Directory and Windows Server administration
• Experience with network troubleshooting tools and monitoring platforms
• Strong documentation skills and familiarity with IT change management processes
• Ability to troubleshoot complex infrastructure issues across systems and networks

Preferred Qualifications

• Experience working in CMMC, NIST 800-171, or similar environments
• Hands-on experience with Cisco ISE for network authentication and access control
• Cisco CCNA or CCNP certifications

Location:

Huntsville, AL

IERUS Technologies is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status, age, or any other federally protected class.

IERUS Technologies participates in E-Verify.