Systems and Network Administrator

Systems AdministratorIERUS 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 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 Qualifications5–8 years of IT experienceMinimum of 3 years networking experienceCurrent CompTIA Security+ certificationMust be a U.S. Citizen with an active DoD Secret ClearanceStrong experience with Cisco networking technologies (switching, routing, VLANs, ACLs, etc.)Experience administering Palo Alto firewalls and security policiesExperience supporting Microsoft 365 environmentsStrong knowledge of Active Directory and Windows Server administrationExperience with network troubleshooting tools and monitoring platformsStrong documentation skills and familiarity with IT change management processesAbility to troubleshoot complex infrastructure issues across systems and networksPreferred QualificationsExperience working in CMMC, NIST 800-171, or similar environmentsHands-on experience with Cisco ISE for network authentication and access controlCisco CCNA or CCNP certificationsActive DoD Secret clearance.Location: Huntsville, ALIERUS 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.