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Firewall Engineer II

CACI International

Arnold, MOFull-time$63–130K/yrSeen todaySeen in employer's feed today

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At a glance

Compensation
$63–130K/yr
Location
Arnold, MO
Schedule
Full-time
Work Authorization
Citizenship required

Olive focuses on jobs in the United States, including remote roles you can work from there.

Requirements

Credentials this posting asks for.

DoD 8140.01 And 8570.01-M IAT Level II Certification, requiredCSSP Infrastructure Support Certification, requiredTS/SCI clearance, required

Job overview

CACI is hiring Firewall Engineers at varying experience levels for its Network Security Services team, supporting the National Geospatial-Intelligence Agency’s GEOINT mission. The role works with corporate and customer leadership to implement enterprise network security solutions and enhancements. The position may be based in the St. Louis, Missouri area and requires a current TS/SCI clearance.

Skills & qualifications

RequiredNice to have

Skills

Firewall Administration, requiredRouter and Switch Administration, requiredIntrusion Detection Systems, requiredUnix, requiredRHELS, requiredWindows Enterprise AD, requiredVMware, required

Qualifications

TS/SCI Clearance, requiredU.S. Government Polygraph, requiredBachelor's Degree or Experience, required2+ Years Network Security Experience, requiredDoD 8140.01 and 8570.01-M IAT Level II Certification, requiredCSSP Infrastructure Support Certification, required

Benefits

Paid Time Off
401(k) Match
Tuition Assistance

Full job description

Job Title: Firewall Engineer II

Job Category: Information Technology

Time Type: Full time

Minimum Clearance Required to Start: TS/SCI

Employee Type: Regular

Percentage of Travel Required: Up to 10%

Type of Travel: Local


The Opportunity:

CACI's Transport & Cybersecurity Services (TCS) program is actively seeking TS/SCI-cleared Firewall Engineers to join our Network Security Services (NSS) team! We are hiring for multiple openings for this role, at varying experience levels, and with the potential to be based out St. Louis, MO. TCS offers a long-term, CACI prime contract opportunity supporting the National Geospatial-Intelligence Agency’s (NGA) GEOINT mission. Our team of talented Network and Cybersecurity professionals help design, develop, procure, implement, operate/sustain, and enhance NGA networks and cybersecurity posture in support of national security. For additional information and a list of current openings, please visit the TCS Jobs page on the CACI Careers site: https://careers.caci.com/global/en/tcs-jobs

As a member of the TCS Network Security Services (NSS) team, you will work with both corporate and customer leadership to research, analyze, and implement enterprise-wide network security solutions/capabilities/enhancements to support customer business/mission goals and objectives.

Responsibilities:

  • Assist with design, analysis, testing, and implementation of state-of-the-art secure network architectures.

  • Conduct risk assessment and provide design recommendations.

  • Manage WAN, LAN, CAN, and remote network security as well as incident and problem management.

  • Oversee security infrastructure sustainment, maintenance, and advanced configuration. (firewalls, F5 load balancers, web gateways, mail gateways, IDS, and management tools).

  • Oversee the reporting, documentation, and investigation of all security-related incidents; lead the development and implementation of corrective measures.

  • Develop and execute standard operating procedures (SOPs) for security tools.

  • Evaluate and report on new network Security technologies to enhance the capabilities of the network.

  • Act as liaison to the contract and customer management, and government Designated Approving Authority (DAA) regarding network security status, policies, and procedures.

Qualifications:

Required:

  • TS/SCI (current) • Must be able to successfully pass/maintain a U.S. Government Polygraph (post-hire)

  • BA/BS Degree and typically between Two (2) and Eight (8) years of related technical experience in Network Security with large-scale enterprise/global networks in a high-paced, diverse environment. (Additional experience may be considered instead of a degree.)

  • DoD 8140.01 and DoD 8570.01-M IAT Level II compliant certification (current)

  • Must be able to successfully obtain/maintain CSSP Infrastructure Support certification within 120 days of start date (post-hire)

  • Firewalls (e.g. Palo Alto, Juniper, Cisco, etc.)

  • Routers/Switches (e.g. Juniper, Cisco, etc.)

  • Intrusion Detection Systems / IDS Products (e.g. FireEye, F5 Load Balancer, Cisco FTD, etc.)

  • Unix, RHELS OS, Windows Enterprise AD, VMware

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:

$63,300-$129,700

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.

How this job compares

Set against the 444 open Network Security Engineer jobs on Olive Jobs, counted November 14, 2026.

Pay
  • This posting$63–130K/yr
  • US median$126–180K/yr375 salary ranges

This range's midpoint, $97K, is 35% below the US median midpoint ($149K) — in the lowest quarter of Network Security Engineer salary ranges across the US.

Openings
Olive Jobs lists 444 open Network Security Engineer jobs across the US. 4% of them nationwide are listed as remote or flexible.
Hiring the most across the US
Experience
This posting asks for at least 2 years of experience — less than three in four Network Security Engineer postings that state a minimum ask for (median 7 years, across 421 postings).
Education
86 of the 444 open Network Security Engineer jobs (19%) ask for a bachelor's degree or higher.

Counted across the open, public US postings on Olive Jobs on November 14, 2026. Figures based on too few postings are left out.

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