> Markdown version of [/jobs/ext/3973342-information-system-security-engineer](https://www.wearedevelopers.com/jobs/ext/3973342-information-system-security-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Information System Security Engineer - **Company:** Mantech International Corporation - **Location:** Washington, DC, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Software Applications, Systems Engineering, Cyber Security, Computer Networks, Data Security, Information Security Management, Internet Security, Information Systems Security Architecture Professional, Information Systems Security Engineering Professional, Network Security, Network Planning and Design, Nmap, Office Suite, Software Security, Information Technology, Tenable Nessus - **Published:** October 27, 2026 - **Apply:** https://www.careerbuilder.com/job-details/information-system-security-engineer-washington-dc--baa0c28e-ab1f-42f7-b010-0b408ea66081 ## About the Role Information Systems Security Engineering (ISSE), Information Systems Security Engineering (ISSE), Computer Security, Customer Relations, Systems Engineering, Information/Data Security (InfoSec), Needs Assessment, Internet Security, Security Architecture, Network Design, + Must meet one of the following levels of experience: A high school diploma/GED and 14 years' experience, an Associate's degree and 10 years' experience, a Bachelors degree and 8 years' experience, or a Master's and 6 years' experience. + Hold at least one of the following certifications: Certified Information Systems Security Professional (CISSP) (or Associate), CompTIA Advanced Security Practitioner (CASP) CE, Certified Secure Software Lifecycle Professional (CSSLP), CISSP- Information System Security Engineering Professional (ISSEP), or CISSP- Information System Security Architecture Professional (ISSAP). + Familiarity with the use and operation of security tools including: Tenable Nessus and/or Security Center, IBM Guardium, HP WeblInspect, Network Mapper (NMAP), and/or similar applications. + Working knowledge of the National Institute of Standards and Technology (NIST) Risk Management Framework (RMF) and ATO processes. Preferred Qualifications: + Degree in Computer Science, Cybersecurity, or other cyber discipline. Security Clearance Requirements: + Must have an active TOP SECRET security clearance and be willing and able to obtain SCI eligibility prior to start. + Selected candidate must be willing to undergo a Polygraph. Physical Requirements: + Must be able to remain in a stationary position 50% + Needs to occasionally move about inside the office to access file cabinets, office machinery, etc. + Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer + Often positions self to maintain computers in the lab, including under the desks and in the server closet ## Description MANTECH seeks a motivated, career and customer-oriented SeniorInformation System Security Engineer (ISSE) to join our team in Washington, D.C., Chantilly, VA or Quantico, VA. Responsibilities include, but are not limited to: + Identify information protection needs for an IS and Network Environment. Define IS and Network Environment security requirements in accordance with applicable cybersecurity requirements + Design security architectures for use within the IS and Network Environment. Design and develop cybersecurity-enabled products for use within an IS and Network Environment + Integrate and/or implement security with Cross Domain Solutions (CDS) for use within an IS and Network Environment + Develop and implement security designs for new or existing network system(s). Ensure that the design of hardware, operating systems, and software applications adequately address cybersecurity requirements for the IS and Network Environment + Design, develop, and implement network security measures that provide confidentiality, integrity, availability, authentication, and non-repudiation. Design, develop, and implement specific cybersecurity countermeasures for the IS and Network Environment + Develop interface specifications for the IS and Network Environment. Develop approaches to mitigate IS and Network Environment vulnerabilities and recommend changes to network or network system components as needed + Ensure that network system(s) designs support the incorporation of FBI directed cybersecurity vulnerability solutions