DoD Network Security Engineer (TS/SCI)

DSA; Charlottesville (VA); On-site; USD 120,000 - 160,000; Full time

Job summary

Data Systems Analysts, Inc. (DSA) seeks a TS/SCI cleared Network Security Specialist to secure and defend enterprise Cisco-based networks in a strict DoD environment.

The role involves hands-on security configuration, boundary defense, vulnerability remediation, and device hardening across Cisco routers, switches, and firewalls. The ideal candidate collaborates with engineers, administrators, and mission partners to keep systems hardened, resilient, and operationally effective, with strong

Qualifications

• BS degree in Engineering, Computer Science, or related field; experience may substitute for degree.
• TS/SCI Clearance and ability to obtain/security clearance.
• DoD 8140 (8570) IAT Level II Certification.
• CCNA certification.

Responsibilities

• Configure and review firewall rules, ACLs, ports, protocols, services, VPN connections, network flows, and boundary protection controls.
• Configure, validate, and audit security configurations for Cisco routers, switches, firewalls, and related network infrastructure.
• Support active network security operations, boundary defense engineering, and continuous hardening for enterprise network systems.
• Support incident response by analyzing network alerts, logs, firewall events, syslog data, and authentication events.
• Support change control reviews by assessing proposed network changes for cybersecurity impacts and security alignment.
• Monitor network security posture through syslog alerts, configuration tools, and packet‑level analysis.
• Conduct, analyze, and remediate vulnerability scans using ACAS, Nessus, STIG Viewer, SCAP, and other DoD tools.
• Analyze vulnerability findings, identify false positives, engineer workarounds, and remediate across network devices.
• Implement and validate DISA STIG compliance, SCAP benchmarks, security baselines, and device hardening requirements.
• Develop and maintain technical network security documentation including device hardening procedures, network diagrams, and PPS listings.
• Support engineering assessments and security reviews to maintain authorization sustainment.

Skills

Network security

Boundary defense

Vulnerability remediation

Cisco network infra

Documentation

Collaboration

Education

Bachelor's degree in Engineering/CS

Tools

ACAS

Nessus

STIG Viewer

SCAP

Syslog

Wireshark

OpenSearch

Job description

Data Systems Analysts, Inc. (DSA) seeks a TS/SCI cleared Network Security Specialist to secure and defend enterprise Cisco-based networks in a strict DoD environment.

The role involves hands-on security configuration, boundary defense, vulnerability remediation, and device hardening across Cisco routers, switches, and firewalls. The ideal candidate collaborates with engineers, administrators, and mission partners to keep systems hardened, resilient, and operationally effective, with strong