Senior Information System Security Officer (ISSO)

We are seeking a highly motivated and experienced Senior Information System Security Officer (ISSO) to join our growing team. In this role, you will play a critical role in safeguarding our organization's information assets by developing, implementing, and maintaining comprehensive security programs. You will work closely with various stakeholders across our customer’s government organization to ensure compliance with industry regulations and best practices. The candidate in this role can choose which site to work from (Fairfax, Warrenton or Fort Washington). Responsibilities Lead the assessment and authorization (A&A) process for information systems, following frameworks like RMF or NIST 800-53. Develop and maintain security documentation, including System Security Plans (SSPs), Risk Assessments, and Security Assessment Reports. Conduct security risk assessments and identify vulnerabilities in systems and processes. Implement and manage security controls to mitigate identified risks. Perform security audits and penetration testing to identify and address weaknesses. Develop and deliver security awareness training programs for employees. Investigate and respond to security incidents and breaches. Stay up to date on the latest security threats and trends. Collaborate with IT and other departments to ensure security is integrated into all business processes. Contribute to the development and implementation of the organization's overall security strategy. Minimum Qualifications Bachelor's Degree in data science, Statistics, Computer Science, or a related field (bachelor’s degree with relevant experience considered). 5 or more years of experience as an ISSO or similar role. Proven experience with the Risk Management Framework (RMF) or NIST 800-53. Experience with security tools and technologies, such as vulnerability scanners, SIEMs, and firewalls. Security+ certification Preferred Qualifications Master's Degree in Related Field Excellent communication, interpersonal, and problem-solving skills. Ability to work independently and as part of a team. Additional industry certifications preferred (CISSP,CISA, etc.) Clearance Requirements TS/SCI Physical Requirements The person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, or virtual communication, which may involve delivering presentations. For all positions requiring access to technology/software source code that is subject to export control laws, employment with the company is contingent on either verifying U.S.-person status or obtaining any necessary license. The applicant will be required to answer certain questions for export control purposes, and that information will be reviewed by compliance personnel to ensure compliance with federal law. ManTech may choose not to apply for a license for such individuals whose access to export-controlled technology or software source code may require authorization and may decline to proceed with an applicant on that basis alone. 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 because of race, color, sex, religion, age, sexual orientation, gender identity and expression, national origin, marital status, physical or mental disability, status as a Disabled Veteran, Recently Separated Veteran, Active Duty Wartime or Campaign Badge Veteran, Armed Forces Services Medal, or any other characteristic protected by law. If you require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please contact ManTech's Corporate EEO Department at View phone number on click.appcast.io. ManTech is an affirmative action/equal opportunity employer - minorities, females, disabled and protected veterans are urged to apply. ManTech's utilization of any external recruitment or job placement agency is predicated upon its full compliance with our equal opportunity/affirmative action policies. ManTech does not accept resumes from unsolicited recruiting firms. We pay no fees for unsolicited services. #J-18808-Ljbffr