Systems Security Engineer: TS/SCI with Poly Required

Clearance Level
Top Secret SCI + Polygraph
Cyber Engineering
McLean, Virginia

REQ#: RQ122353

Travel Required: Less than 10%
Requisition Type: Regular

We are GDIT. We provide solutions and deliver actionable intelligence to analysts, warfighters, policymakers, and more.

Make GDIT your place by being resourceful and delivering your best every day. Own your opportunity at GDIT and you’ll be a critical part of ensuring the safety and security of our nation. Our work depends on a Senior Systems Security Engineer joining our team to support our client activities in McLean, VA.

Members of the ISSO team support our work on assessment and authorization (A&A) of critical systems, detection of adversary behavior, and improving the defensive posture of our customer's information systems. The successful candidate will use various tools and methodologies to evaluate the state of systems and applications for vulnerabilities, verify protection against adversary intent, and evaluate cyber security processes to protect and defend against our adversaries.

Requirements and Qualifications:

  • TS/SCI with polygraph

  • BS Degree AND 5 years of demonstrated cybersecurity expertise OR equivalent combination of education and experience

  • Ability to work closely with stakeholders, developers, and external teams including customer security managers (ISSMs), organizational leadership, and key personnel.

  • Identify requirements for documentation associated with system categorization, the System Security Plan, and systems risk assessment as required under NIST 800-53/53A.

  • Assess system compliance with NIST requirements, identifying weaknesses and evaluating planned remedial actions based upon those requirements.

  • Support control implementation assessment and reporting and monitoring processes using cyber security and assessment management systems.

  • Understanding of perimeter controls (firewalls), access control mechanisms, and network architectures.

  • Strong understanding of methodologies for researching and documenting software and hardware vulnerabilities.

  • Skilled in cross-team collaboration and effective communication to fulfill specific accreditation requirements.

  • Strong verbal and written communication/cooperation within a team context.

  • Ability to work within fast-paced customer environments.

  • Demonstrated skill documenting processes and procedures in CONOPS, system security, contingency, configuration management and other plans.

  • Demonstrated ability to facilitate customer concurrences required for risk-based decisions requiring waivers.

  • Experience assisting the customer with decisions impacting the security posture and compliance of their systems and networks with requirements as documented in NIST 800-53 and its revisions.


  • Knowledge of the customer's organization, their network systems and infrastructure, processes and procedures, and request and approval tools.

  • Experienced in scripting/program languages such as Bash, Powershell, or Python.

  • Ability and knowledge of network/packet analysis (Wireshark/TCPDump).

  • Proficient in Linux, Windows, and TCP/IP networking.

  • Skilled with and/or demonstrated technical aptitude with vulnerability and risk assessment tools such as Elasticsearch or Splunk SIEMs, Rapid7 Nexpose, and IDS/IPS monitoring and alerting.


  • 401K with company match

  • Rewards program for high-performing employees

  • Challenging work that makes a real impact on the world around you

  • Internal mobility team dedicated to helping you own your career

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About Our Work

We are GDIT. The people supporting some of the most complex government, defense, and intelligence projects across the country. We deliver. Bringing the expertise needed to understand and advance critical missions. We transform. Shifting the ways clients invest in, integrate, and innovate technology solutions. We ensure today is safe and tomorrow is smarter. We are there. On the ground, beside our clients, in the lab, and everywhere in between. Offering the technology transformations, strategy, and mission services needed to get the job done.

COVID-19 Vaccination

GDIT does not have a vaccination mandate applicable to all employees. To protect the health and safety of its employees and to comply with customer requirements, however, GDIT may require employees in certain positions to be fully vaccinated against COVID-19. Vaccination requirements will depend on the status of the federal contractor mandate and customer site requirements.

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.