Senior Network Security Engineer — Zero Trust & Cisco Expert

The MIL Corporation; Washington (District of Columbia); On-site; USD 101,000 - 151,000; Full time

Job summary

The MIL Corporation seeks a Senior Network Security Engineer to design, implement, and maintain a Cisco-based enterprise network, advancing Zero Trust initiatives and federal cybersecurity standards. You will lead network engineering, security architecture, vulnerability remediation, and incident response across core, distribution, access, and perimeter environments.

This on-site role is initially unfunded and contingent on contract funding; the candidate will provide technical leadership and

Qualifications

• Minimum 8 years of experience supporting enterprise network environments.
• Minimum 5 years of hands-on Cisco networking experience.
• Strong experience with Cisco routing and switching, network segmentation, VLANs, DNS, DHCP, VPN technologies, 802.1X NAC, firewall administration and network security.
• Experience implementing NIST 800-53 security controls and Zero Trust Architecture initiatives.
• Strong troubleshooting, analytical and documentation skills.

Responsibilities

• Design, implement, and maintain enterprise network infrastructure across core, distribution, access, and edge environments.
• Configure, manage, and troubleshoot Cisco routing and switching technologies; administer VLANs, DNS, DHCP, VPNs, and NAC.
• Perform root cause analysis for outages, performance issues, and security incidents; maintain architecture documentation and standards.
• Implement and maintain network security controls aligned with Zero Trust and NIST frameworks; manage 802.1X and perimeter firewall policy management.
• Support monitoring of network infrastructure; integrate devices with SIEM; coordinate vulnerability remediation and incident response; ensure audit-ready documentation.

Skills

Cisco routing

Cisco switching

VLANs

DNS

DHCP

VPN

802.1X

Firewall

Monitoring/logging

Vulnerability management

Incident response

NIST 800-53

Zero Trust

Network hardening

Education

Bachelor's degree

Tools

Cisco Identity Services Engine (ISE)

Job description

The MIL Corporation seeks a Senior Network Security Engineer to design, implement, and maintain a Cisco-based enterprise network, advancing Zero Trust initiatives and federal cybersecurity standards. You will lead network engineering, security architecture, vulnerability remediation, and incident response across core, distribution, access, and perimeter environments.

This on-site role is initially unfunded and contingent on contract funding; the candidate will provide technical leadership and