Network Security Engineer, Senior | Top Secret w/SCI eligibility

AMERICAN SYSTEMS, a 100% employee-owned federal contractor, is seeking a Senior Network Security Engineer to help operate and secure classified network infrastructure for a Department of Defense customer at China Lake, CA.

In this role, you’ll bring together hands-on Cisco network engineering and cybersecurity skills to keep mission systems secure, reliable, and available. You’ll work independently on assigned priorities while partnering closely with technical teams, customers, and vendors to solve operational challenges.

As a Senior Network Security Engineer with AMERICAN SYSTEMS, you will:

• Configure, administer, and troubleshoot Cisco routers and switches supporting classified networks.
• Install, maintain, and optimize enterprise LAN/WAN infrastructure.
• Monitor network health, system logs, backups, and scheduled jobs to help ensure reliable day-to-day operations.
• Support remote users with equipment setup and Layer 2/Layer 3 connectivity troubleshooting.
• Diagnose and resolve Cisco infrastructure, VPN, and VMware-related connectivity issues.
• Perform authorized software installations, upgrades, license management, and security patching.
• Manage user accounts and access controls in alignment with cybersecurity best practices and customer requirements.
• Support incident response, vulnerability remediation, and identification of potential security risks.
• Help maintain network procedures, technical documentation, and operational standards.
• Collaborate with internal teams and vendor representatives to resolve technical and operational issues.
• Work with minimal supervision while contributing to the overall security posture of the environment.

• Active Top Secret clearance w/SCI eligibility and ability to obtain SAP access
• U.S. citizenship, required to obtain and maintain a U.S. security clearance
• Bachelor’s degree in Information Technology, Cybersecurity, or a related field. Additional relevant experience may be considered in place of a degree.
• 5–7 years of experience supporting enterprise networks in DoD, federal, or similarly regulated environments
• Current CCNA certification
• Current DoD 8140 IAT Level III certification, such as CASP+ CE, CCNP Security, CISA, CISSP or Associate, GCED, GCIH, CCSP, or CISM
• Hands-on experience configuring and maintaining Cisco network infrastructure
• Experience supporting or implementing the Risk Management Framework (RMF) in accordance with DoD and Department of the Navy cybersecurity requirements
• Familiarity with vulnerability management, patch compliance, and information assurance controls
• Experience supporting Solaris, Linux, or UNIX-based systems
• Experience installing or configuring intrusion detection systems, firewalls, or other perimeter defense technologies
• Experience supporting continuity of operations planning, failover testing, or system-availability documentation
• Experience integrating network infrastructure with broader enterprise systems

• Candidates who have limited Solaris or systems engineering experience but strong network security fundamentals and a willingness to learn may be considered.
• This role offers the opportunity to build experience across network engineering, systems administration, and cybersecurity.

Note: This position supports a classified DoD environment. Candidates must be able to meet all security clearance and customer access requirements.