ManTech seeks an **Information Systems Security Engineer (ISSE)** to join our team in **Herndon, Virginia** . Join ManTech and help protect our country against cyber adversaries by creating robust and cutting-edge cybersecurity solutions. **Responsibilities include, but are not limited to:** + Review and assess Risk Management Framework (RMF) authorization body of evidence for classified information systems, to include System Security Plan (SSP), Security Control Traceability Matrix (SCTM), Continuous Monitoring Plan, Incident Response Plan, Access Control Plan, and Security Assessment Plan + Review new and existing systems for technical compliance with IA directives and protection of data at all classification levels including SCI + Advise on in-depth security design review and threat/risk assessments + Provide inputs to technical artifacts, including Plans of Action and Milestones (POA&Ms), Security Control Traceability Matrices (SCTM), and Risk Assessment Reports (RARs) + Conduct site visits (as required) and assessments to inspect IA plans and security control implementations and support Incident Response Team (IRT) activities **Minimum Qualifications:** + Bachelor’s degree and 3+ years of technical experience or High School Diploma and 7+ years of technical experience + 3+ years of implementing NIST 800-53, Rev 4 and the Risk Management Framework (RMF) + 3+ years of using information security and assurance practices and principles for the customer + 3+ years of experience with Windows and Linux environments + 3+ years of experience with virtualization or cloud environments + Experience with information security tools such as MS Active Directory, Splunk, ACAS/Nessus, McAfee and AWS Security + DoD 8570 IAT Level II certification or higher **Preferred Qualifications:** + Knowledge of enterprise cyber defense tools and technologies such as SIEM systems, SysMon, network and host based IDS and IPS, network and host-based malware detection and prevention, Endpoint Detection & Response (EDR) and Network Detection & Response (NDR), Network and Host malware detection and prevention (EDR/NDR) tools, forensics tools and applications, Web/Email gateway security technologies, Security Orchestration, Automation and Response (SOAR) and cloud based platforms such as Azure, AWS, or Google **Clearance Requirements:** + Must have a current/active TS/SCI w/Polygraph **Physical Requirements:** + The person in this position must be able to remain in a stationary position 50% of the time ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at careers@mantech.com and provide your name and contact information.