**ManTech** seeks a motivated, career and customer-oriented **Information System Security Officer (ISSO)** to join our team in **Washington, D.C.** This is a hybrid position with 1 – 2 days a week onsite. **Responsibilities include but are not limited to:** + Provide support for government programs, legacy systems, future systems to be acquired for information assurance and support evaluating security solutions of legacy systems and future systems being developed to ensure they meet security requirements for processing classified information + Support the customer in achieving the approval for a program for the Authority to Operate (ATO), implement and manage NIST 800-53 Rev. 4 Security Controls and align systems activities to the NIST Cyber Security Framework (CSF) + Develop, maintain and manage Security Authorization and Assessment packages that include System Security Plans (SSP), Contingency Plans (CP), certification and Accreditation (C&A) packages and other relevant security documentation for existing and new systems and support government security authorization activities in compliance with the NSA/CSS Information System Certification and Accreditation Process (NISCAP) + Provide support for proposing, coordinating, implementing, and enforcing information systems security policies, standards, and methodologies + Review system security to accommodate changes to policy or technology and evaluate IT threats and vulnerabilities to determine whether additional safeguards are needed and support the development and enhancement of systems security policies, standards, and procedures and track implementation and compliance + Advise the government concerning the impact levels for Confidentiality, Integrity, and Availability for the information on a system + Conduct certification tests that include verification that the features and assurances required for each protection level are in place **Minimum Qualifications:** + Requires a detail-oriented self-starter experienced in supporting senior Government leaders and other technical/business professionals + Knowledge of current security tools, hardware/software security implementation, communication protocols or encryption techniques/tools is required + Must be familiar with NIST and CMS security documentation, including but not limited to NIST 800-53, NIST 800-63, CMS Acceptable Risk Safeguards (ARS), CMS Risk Management Handbook (RMH) and CMS Federal Information Security Management Act (FISMA) Controls Tracking System (CFACTS) + Superior customer interface skills at senior levels of management with excellent oral and written communication skills are critical + M.S. degree and ten years of experience or a B.S. degree and 18 years of experience is required **Preferred Qualifications:** + Previous Customs and Border Protection (CBP) experience + A current CISSP certification **Clearance Requirements:** + Must be a US citizen and be able to obtain and maintain a CBP Public Trust prior to starting this position **Physical Requirements:** + Must be able to be in a stationary position more than 50% of the time + Constantly operates a computer and other office productivity machinery, such as a computer + The person in this position frequently communicates with co-workers, management and clients, which may involve delivering presentations ad must be able to exchange accurate information in these situations 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.