Network Engineer, Senior (HPC)

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.

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

• 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

• 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