Become an integral part of a diverse team while working at an Industry Leading Organization, where our employees come first. At ManTech International Corporation, you’ll help protect our national security while working on innovative projects that offer opportunities for advancement. Currently, ManTech is seeking a motivated, career and customer-oriented **Information System Security Engineer** to join our team in **Aurora, CO** . The position is part of a team that provides systems engineering, software development, configuration management and application testing support for a Weapons and Space software development effort. **Responsibilities include, but are not limited to:** + Participates as the primary security engineering representative on engineering teams for the design, development, implementation, evaluation, and/or integration of secure networking, computing, and enclave environments + Applies knowledge of IA policy, procedures, and workforce structure to design, develop, and implement secure networking, computing, and enclave environments + Support the government in complying with Agency Systems Security Certification & Accreditation (C&S) processes, to include discovery meetings, achieving Interim Approval to Test (IATT) and in obtaining final Approval to Operate (ATO) status for Systems Security Plans (SSP) associated with all mission systems. + Work with all appropriate agency elements to gain successful accreditation. + Provide expertise with agency C&A policy, processes & tools. + Fill roles of Information Systems Security Officer (ISSO). + Manage all security relevant changes to the mission systems, assuring SSP documentation is up-to-date and ATO status is maintained. **Minimum Qualifications:** + Bachelor’s degree in Computer Science, Information Assurance, information Security System Engineering, or a related discipline and 20 years of experience or 24 years of total experience or a Master’s Degree and 18 years of experience + DoD 8570 compliance with IASAE Level 3 is required as well as Information Systems Security Engineering Professional (ISSEP) and CISSP Certification are required + Provides security planning, assessment, risk analysis, and risk management + Recommends system-level solutions to resolve security requirements + Identifies overall security requirements for the proper handling of Government data + Provide guidance for a Plan of Action and Milestones (POA&M) and Continuous Monitoring Plan + Perform Pre-Security Controls and Analysis Assessments (PSAs). Foster improved security of all systems using Enterprise solutions. + Providing technical leadership for the integration of requirements, design, and technology. Incorporates new plans, designs, and systems into ongoing operations **Preferred Qualifications:** + Shall have direct experience with an intelligence community or signals intelligence activity. + Experience with Atlassian tool suite (e.g., JIRA, Confluence) + Shall have experience with the NSA Certification and Accreditation process (NISCAP). + Shall have experience developing security plans for employing enterprise-wide security architecture **Security Clearance Requirements:** + Current and active TS/SCI with polygraph based upon a SSBI 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.