ManTech is seeking a motivated, career and customer-oriented **Information System Security Officer (ISSO)** to join our team in Washington, DC! This position currently offers a flexible hybrid schedule. **Responsibilities include but are not limited to:** + Provide support for government programs, legacy systems, future systems to be acquired for information assurance + 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 + Develop, maintain and manage Security Authorization and Assessment packages that include System Security Plans (SSP), Contingency Plans (CP), and other relevant security documentation for existing and new systems + Align systems activities to the NIST Cyber Security Framework (CSF) + Identify and support system Interconnection Security requirements + Provide support for proposing, coordinating, implementing, and enforcing information systems security policies, standards, and methodologies + Support the development and enhancement of systems security policies, standards, and procedures and track implementation and compliance + Support evaluating security solutions of legacy systems and future systems being developed to ensure they meet security requirements for processing classified information + Support vulnerability/risk assessment analysis to support certification and accreditation + Prepare and review documentation to include Systems Security Plans (SSPs), Risk Assessment Reports, and Certification and Accreditation (C&A) packages + Support government security authorization activities in compliance with the NSA/CSS Information System Certification and Accreditation Process (NISCAP) + Review system security to accommodate changes to policy or technology + Evaluate IT threats and vulnerabilities to determine whether additional safeguards are needed + 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:** + A current CISSP certification is preferred **Clearance Requirements:** + Must be a US Citizen and be willing and able to obtain a CBP Public Trust prior to start **Physical Requirements:** + Must be able to remain in a stationary position 50% 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.