Network Engineer, Senior (HPC) with Security Clearance

AMERICAN SYSTEMS, a 100% employee-owned federal government contractor, is seeking a Senior Network Engineer with strong Linux CLI experience to support a secure RHEL-based HPC environment in Arlington, VA. This role is ideal for a hands-on engineer who can support high-bandwidth, low-latency networks, troubleshoot across network devices and Linux hosts, and help maintain secure, mission-critical inter-site connectivity in a performance-sensitive environment. This role includes a $5,000 sign-on bonus in addition to a generous compensation package. Responsibilities As a Senior Network Engineer working in a secure high-performance computing environment, you will: * Support the design, implementation, and optimization of high-bandwidth, low-latency inter-site networks * Troubleshoot connectivity and performance issues using Linux CLI tools and network device command line interfaces * Administer RHEL-based networked environments, including interfaces, bonding, VLAN tagging, routing, DNS, DHCP, and name resolution * Configure and support Cisco, Juniper, and Ciena infrastructure, including routing, switching, firewalls, VPNs, optical transport, and data circuits * Support network segmentation, ACLs, VLANs, VPNs, and device access control in secure environments * Assist with Cisco ISE administration, authentication, authorization, and policy enforcement * Analyze and resolve issues involving routing, MTU, latency, throughput, and traffic flow * Support maintenance, upgrades, technology refresh, documentation, network diagrams, and operational procedures * Partner with systems, cybersecurity, and infrastructure teams to sustain secure, reliable mission operations Qualifications * TS/SCI clearance with SAP eligibility * DoD 8140 IAT II certification or higher, such as Security+ CE * Bachelor's degree in IT, Computer Science, Engineering, or related field, or equivalent directly related experience in lieu of degree * 5-7 years of experience in network engineering, network administration, or related infrastructure roles * CCNA or higher certification * Strong experience with Linux CLI, including troubleshooting on RHEL-based systems * Experience with Linux networking concepts such as interfaces, bonding, VLAN tagging, routing, name resolution, port connectivity, and performance analysis * Experience using tools such as ip, ss, tcpdump, ping, traceroute, dig, and nslookup * Experience supporting high-bandwidth, low-latency, multi-site networks * Strong knowledge of Layer 2/Layer 3, TCP/IP, VLANs, routing, ACLs, DNS, DHCP, high availability, segmentation, MTU, latency, and throughput * Experience with Cisco routing and switching, firewalls, VPNs, and high-capacity data circuits * Ability to work independently with general direction in a mission-focused team environment Ideal Qualifications * Experience with Juniper and Ciena * Experience supporting HPC, research computing, or other performance-sensitive environments * Experience with Cisco ISE * Familiarity with optical transport and inter-site connectivity * Strong documentation and cross-team collaboration skills * Professional, adaptable, and open to learning new tools and technologies AMS1 Pay Transparency Statement AMERICAN SYSTEMS is committed to pay transparency for our applicants and employee-owners. The salary range for this position is USD $150,000.00/Yr. - USD $180,000/Yr. Actual compensation will be determined based on several factors permitted by law. AMERICAN SYSTEMS provides for the welfare of its employees and their dependents through a comprehensive benefits program by offering healthcare benefits, paid leave, retirement plans, insurance programs, and education and training assistance. EEO Statement EEO Race/Sex/Disability Status/Veteran Status