Cyber Security Engineer - NSS Tools

CACI International Inc; St. Louis (MO); On-site; USD 75,000 - 158,000; Full time

Job summary

CACI is seeking a Cyber Security Engineer for the NSS Tools team. The role focuses on developing, deploying, and maintaining cybersecurity tools to defend NGA networks across multiple locations globally. Responsibilities include architecture documentation, tool deployment, and leadership briefings.

The candidate will work with Linux environments, log analysis, and DoW/IC standard practices, with opportunities to advance security capabilities and contribute to mission-critical operations.

Qualifications

• Active TS/SCI clearance required.
• Ability to obtain/maintain CI polygraph.
• DOD 8570 IAT II certs (Security+, CySA+, etc.).
• DOD 8570 CSSP Infrastructure certs (CEH, CySA+, etc.).
• Willingness to work weekends/evenings as needed.
• Ability to work independently with minimal supervision.

Responsibilities

• Design, implement, and deliver defensive cybersecurity solutions for on‑premise and cloud environments.
• Deploy, configure, and maintain network security tools and ensure core services function per design.
• Develop and maintain network architecture diagrams, inventories, and licensing status.
• Provide written reports and oral briefings to contract and government leadership.
• Coordinate issues with stakeholders to ensure task completeness and customer satisfaction.
• Evaluate and report on new/emerging network security technologies to enhance capacity and reliability.
• Evaluate configuration changes and upgrades to address performance and standardization.
• Apply networking protocol knowledge and use troubleshooting tools to diagnose issues.

Skills

Security clearance TS/SCI

CI polygraph

DOD 8570 IAT II

DOD 8570 CSSP Infrastructure

Weekend/evening hours

Independence

DoW PKI Kerberos LDAP AD SAML OAuth

Education

Bachelor’s degree in CS / IT / CE / EE or related

Tools

NDR platforms (VectraAI)

NDR platforms (Extrahop)

NDR platforms (Darktrace)

NDR platforms (Corelight)

NDR platforms (Cisco Firepower)

NDR platforms (Trellix NX)

Packet broker platforms (Gigamon)

Packet broker platforms (Ixia)

Packet broker platforms (Garland)

Packet capture platforms (NetWitness)

Packet capture platforms (Axellio)

Packet capture platforms (Endace)

Email security platforms (Trellix EX)

Email security platforms (Cisco Secure Email Gateway)

Email security platforms (Ironport)

Email security platforms (Proofpoint)

Email security platforms (Abnormal)

Job description

• DOD 8570 IAT II certification (Security+, CySA+, etc.)

Job Title: Cyber Security Engineer - NSS Tools

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

TCS is looking for a Cybersecurity Engineer for the Network Security Services – Network Defense team. This position is responsible for developing, deploying, and maintaining cybersecurity tools to defend the National Geospatial-Intelligence Agency (NGA) networks. Duties include designing, procuring, implementing, operating, sustaining, and disposing of IT security solutions on multiple networks, at multiple locations worldwide, in support of the NGA GEOINT mission.

Responsibilities

• Design, implement, and deliver task or project-based defensive cybersecurity solutions for on-premise and cloud environments.
• Deploy, configure, and maintain network security tools, ensuring software installations, updates, core services, and applied configurations are functioning within design specifications.
• Develop and maintain network architecture diagrams, inventories, and licensing status for the various capabilities within the scope of the team.
• Provide written reports and oral briefings to contract and government leadership.
• Coordinate issues with the appropriate stakeholders to ensure task completeness and overall customer satisfaction.
• Evaluate and report on new/emerging network security technologies to enhance capacity, performance and reliability of the networks.
• Evaluate and recommend configuration changes and technology upgrades to address performance, standardization, and align industry best practices.
• Apply a solid understanding of networking protocols and utilize network troubleshooting tools (tcpdump, traceroute, netstat, nslookup, etc.) to diagnose and resolve issues.

Qualifications

Required:

• Security Clearance: Active TS/SCI.
• Ability to obtain and maintain a CI polygraph.
• DOD 8570 IAT II certification (Security+, CySA+, etc.)
• Ability to obtain and maintain DOD 8570 CSSP Infrastructure Support certification (CEH, CySA+, etc.)
• Ability to work weekends and evening hours as needed.
• Ability to work independently with little direction or guidance.

Desired

• Demonstrated knowledge of implementation and management of NDR and IDS/IPS platforms (VectraAI, Extrahop, Darktrace, Corelight, Cisco Firepower, Trellix NX, etc.)
• Demonstrated knowledge of implementation and management of packet broker/network visibility platforms (Gigamon, Ixia, Garland, etc.)
• Demonstrated knowledge of implementation and management of packet capture platforms (NetWitness, Axellio, Endace, etc.)
• Demonstrated knowledge of implementation and management of email security platforms (Trellix EX, Cisco Secure Email Gateway, Ironport, Proofpoint, Abnormal, etc.)
• Expertise in Linux system administration, including scripting and system automation.
• Expertise in configuring system logging, analyzing logs for troubleshooting, and implementing secure networking services.
• Familiarity with DoW PKI, Kerberos, LDAP, Active Directory, and Authentication (SAML, OAuth).
• Bachelor’s degree in Computer Science, Information Technology, Computer Engineering, Electrical Engineering, or related field.
• 7+ years related technical experience to network security technologies, tools, and techniques.
• 5+ years experience with large-scale enterprise/global networks.
• Understanding of DoW, DISA, and IC standards and processes.
• Understanding of DoW network architecture.

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

$75,200-$158,100

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.