Network Security Engineer

CACI; Columbia (MD); On-site; USD 121,000 - 266,000; Full time

Job summary

CACI is seeking a Senior Network Security Engineer to design, evaluate, and secure complex network and hardware systems supporting intelligence operations. You will partner with mission stakeholders and engineering teams to deliver secure, reliable solutions, ensuring government security requirements are met.

The role requires active TS/SCI with Polygraph, 5+ years in network security engineering, and relevant DoD certifications.

Qualifications

• Active clearance TS/SCI with Polygraph.
• 5+ years of Network Security Engineering experience supporting complex SIGINT hardware systems.
• Bachelor’s degree or 5 additional years of experience in lieu of degree.
• DoD 8570 IAT Level II certification.
• At least three of the following certifications: PCNSA, SNSA, SNSP, Symantec ProxySG 6.7 Technical Specialist, Cisco CCNA or higher.

Responsibilities

• Conduct onsite assessments and document current network architectures and mission‑specific requirements.
• Lead and coordinate hardware installations across multiple environments.
• Recommend hardware specifications tailored to unique project needs.
• Support systems engineering teams by modeling and analyzing proposed solutions.
• Design, verify, and implement hardware test interfaces.
• Perform MTBF/MTTR analyses to strengthen reliability and maintainability.
• Analyze operational data to identify system vulnerabilities and performance gaps.
• Evaluate LAN/WAN designs and ensure architectures adhere to mission security needs.
• Research and assess COTS/GOTS technologies to drive mission capability.
• Provide high‑level expertise in network engineering, architecture, and planning.
• Contribute to technical standards, interface specifications, and network troubleshooting.
• Ensure system designs and implementations meet all government security requirements.
• Develop and enhance security documentation for new and existing systems.
• Support wired and wireless network analysis and optimization.
• Conduct vendor comparisons, cost studies, and system scalability assessments.
• Deliver independent evaluations of complex network ecosystems and recommend enhancements.
• Identify and brief system weaknesses with clear, actionable recommendations.

Skills

NSA TS/SCI with Polygraph

Network Security Engineering

DoD 8570 IAT Level II

5+ years experience

Education

Bachelor’s degree or 5 years of related experience in lieu of degree

Tools

PCNSA

SNSA

SNSP

Symantec ProxySG 6.7 Technical Specialist

Cisco CCNA or higher

Job description

Job Title: Network Security Engineer

Job Category: Information Technology

Time Type: Full time

Minimum Clearance Required to Start: TS/SCI with Polygraph

Employee Type: Regular

Percentage of Travel Required: Up to 10%

Type of Travel: Local

Senior Network Security Engineer – Advance the Mission with CACI!

At CACI, we don’t just work on technology—we deliver solutions that strengthen national security and empower critical missions around the world. We’re looking for an experienced Senior Network Security Engineer who is ready to bring deep technical expertise, curiosity, and a commitment to excellence to our high‑impact programs.

In this role, you’ll play a pivotal part in designing, evaluating, and securing complex network and hardware systems that support vital intelligence operations. You will partner with mission stakeholders, engineers, and technical teams to deliver secure, reliable, and innovative solutions that keep our customers a step ahead.

If you’re driven by purpose, inspired by challenge, and ready to grow your career in an environment built on integrity and innovation, CACI is the place to make your mark.

Responsibilities:

• Conduct onsite assessments and document current network architectures and mission‑specific requirements.

• Lead and coordinate hardware installations across multiple environments.

• Recommend hardware specifications tailored to unique project needs.

• Support systems engineering teams by modeling and analyzing proposed solutions.

• Design, verify, and implement hardware test interfaces.

• Perform MTBF/MTTR analyses to strengthen reliability and maintainability.

• Analyze operational data to identify system vulnerabilities and performance gaps.

• Evaluate LAN/WAN designs and ensure architectures adhere to mission security needs.

• Research and assess COTS/GOTS technologies to drive mission capability.

• Provide high‑level expertise in network engineering, architecture, and planning.

• Contribute to technical standards, interface specifications, and network troubleshooting.

• Ensure system designs and implementations meet all government security requirements.

• Develop and enhance security documentation for new and existing systems.

• Support wired and wireless network analysis and optimization.

• Conduct vendor comparisons, cost studies, and system scalability assessments.

• Deliver independent evaluations of complex network ecosystems and recommend enhancements.

• Identify and brief system weaknesses with clear, actionable recommendations.

Qualifications:

Required:

• An active NSA TS/SCI with Polygraph.

• 5+ years of Network Security Engineering experience supporting complex SIGINT hardware systems.

• Bachelor’s degree in a related technical field, or 5 additional years of experience in lieu of degree.

• DoD 8570 IAT Level II certification.

• At least three of the following certifications:

  • PCNSA
  • SNSA
  • SNSP
  • Symantec ProxySG 6.7 Technical Specialist
  • Cisco CCNA or higher

This position is contingent on funding and may not be filled immediately. However, this position is representative of positions within CACI that are consistently available. Individuals who apply may also be considered for other positions at CACI.

What You Can Expect:

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth.

Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.

Pay Range:

There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

The proposed salary range for this position is:

$120,800 - $265,800

CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.