Cyber System Signature / Firewall Administrator - TS/SCI with Polygraph

Clearance Level
Top Secret/SCI
Cyber Security
Washington, District of Columbia
Reston, Virginia
Colorado Springs, Colorado
Onsite Workplace
Key Skills For Success


Firewall Rules

Signature-Based Detection


REQ#: RQ170716
Requisition Type: Regular
Your Impact

Own your opportunity to serve as a critical component of our nation’s safety and security. Make an impact by using your expertise to protect our country from threats.

Job Description

Own your career as a Cyber Intrusion Detection System Administrator at GDIT. Here, you’ll have the opportunity to build strong lines of cyber defense using cutting-edge technologies. Your work in cyber security at GDIT will have an impact on securing our clients’ missions and ensuring we anticipate the threats of tomorrow.

At GDIT, people are our differentiator. As a Cyber Intrusion Detection System Administrator you will help ensure today is safe and tomorrow is smarter.


  • Monitor day-to-day operations of the sensors (Suricata, Palo Alto, and ArcSight) located at supporting customer's locations.

  • Perform Enterprise Defense Countermeasure (DC) activities and coordination with other government agencies to record and prepare incident reports and analysis methodology and results.

  • Monitor and analyze signature alerts from Intrusion Detection/Prevention Systems (IDS/IPS) for false positives.

  • Provide technical enforcement of organizational security policies.

  • Provide “tune-or-drop” recommendations towards the DC team’s Signature Lifecycle Review procedure.

  • Provide insight to Detection and Response teams on signature functionality and providing signature tuning as needed.

  • Communicate with customers and teammates clearly and concisely. 

  • Maintain current knowledge of relevant technology as assigned.

  • Participate in special projects as required. 

  • Position is day shift but may require evening, weekend or shift-work (depending on operational tempo). 


  • Bachelor's Degree and 6+ years of relevant experience, equivalent combinations of education, certifications, and experience will be considered.

  • Required Certifications: 8570 IAT II prior to start date; must obtain CSSP Infrastructure Support, and GIAC Continuous Monitoring (GMON) or equivalent certifications within first 120 days of employment

  • Security Clearance Level: TS/SCI clearance and ability to pass a Polygraph

  • Required Skills and Abilities:

    • Experience authoring Snort signatures.

    • Experience authoring Yara rules.

    • Experience with Perl Compatible Regular Expressions (PCRE).

  • Preferred Skills:

    • Experience in intrusion detection and prevention systems.

    • Proficient in network security technologies and protocols.

    • Dashboarding in Splunk.

    • Palo Alto Certification Next-Generation Firewall

Location: On Customer Site

  • Colorado Springs, CO

  • Bolling AFB, Washington D.C

  • Reston, VA


  • 401K with company match

  • Comprehensive health and wellness packages

  • Internal mobility team dedicated to helping you own your career

  • Professional growth opportunities including paid education and certifications

  • Cutting-edge technology you can learn from

  • Rest and recharge with paid vacation and holidays

Work Requirements
Years of Experience

6 + years of related experience

* may vary based on technical training, certification(s), or degree


Travel Required

Less than 10%


U.S. Citizenship Required

Salary and Benefit Information

The likely salary range for this position is $116,979 - $143,750. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.
View information about benefits and our total rewards program.

About Our Work

We are GDIT. A global technology and professional services company that delivers consulting, technology and mission services to every major agency across the U.S. government, defense and intelligence community. Our 30,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 30 countries worldwide, offering leading capabilities in digital modernization, AI/ML, Cloud, Cyber and application development. Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology.

GDIT is an Equal Opportunity/Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status, or any other protected class.