**MANTECH s** eeks a motivated and customer-focused **Information Systems Security Officer** **(ISSO)** to support cybersecurity operations onsite at **Patuxent River, MD** . In this role, you will help safeguard Department of Defense (DoD) information systems through the implementation of security controls, risk management practices, and compliance with cybersecurity frameworks. **Responsibilities include but are not limited to:** + Implementing and supporting established cybersecurity policies and technical procedures in line with DoD guidance + Conduct vulnerability assessments using ACAS, STIGs, and SCAP tools + Implement security configurations for operating systems and network devices in accordance with DISA guidelines + Perform continuous monitoring, audits, risk analysis, and develop mitigation strategies + Coordinate with system owners to prepare certification letters and Memoranda of Agreement (MoA) + Identify certified technologies using Common Criteria, NIAP, and the DISA Approved Products List (APL) + Collaborate with internal teams and customers to meet evolving cybersecurity requirements + Participate in assessments and reporting in support of RMF compliance + Maintain awareness of SAP-related guidance and standards **Minimum Qualifications:** + Bachelor’s degree in Computer Science, Information Systems Management, Engineering, or a related field + 5+ years of experience in information assurance, cybersecurity, or systems security within a DoD environment + Hands-on experience with RMF, NIST SP 800-53, CNSSI 1253, and JSIG controls + Familiarity with DISA STIGs, ACAS, SCAP tools, and continuous monitoring practices + 3+ years of hands-on experience using SolarWinds IT management products (e.g., Network Performance Monitor, Server & Application Monitor) to monitor, diagnose, and maintain network and system health; this is a required qualification for the position + DoD Approved Baseline Certification (IAM Level II), such as CompTIA CASP+ CE or CISSP **Preferred Qualifications:** + Experience supporting Authorization and Accreditation (A&A) processes under the Risk Management Framework (RMF) lifecycle + Familiarity with enterprise security tools such as Splunk, Tenable Nessus, or McAfee/Trellix + Experience with developing or maintaining System Security Plans (SSPs), POA&Ms, or Security Assessment Reports (SARs) + Knowledge of cloud security compliance frameworks (e.g., FedRAMP, DoD Cloud SRG) + Familiarity with scripting or automation tools (e.g., PowerShell, Python) to support security monitoring or reporting + Experience supporting or securing systems in classified environments, including Special Access Programs (SAP) or SCI enclaves + Working knowledge of security incident response procedures and coordination with SOC teams **Clearance Requirements:** + U.S. Citizenship is required and an active Top Secret security clearance + Additional background screening may be required to obtain base access **Physical Requirements:** + Must be able to operate a computer and other office equipment + Ability to remain in a stationary position for extended periods + Occasionally moves throughout office for file or equipment access + Must be able to exchange accurate information with colleagues and clients + May occasionally lift up to 25 pounds of IT equipment 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.