Information Systems Security Engineer

About the role

General information Requisition # R70761 Locations USA-IN-Crane Posting Date 09/15/2026 Security Clearance Required Interim Secret Remote Type Onsite Time Type Full time Description & Requirements Shape the future of defense with MANTECH! Join a team dedicated to safeguarding our nation through advanced tech and innovative solutions. Since 1968, we’ve been a trusted partner to the Department of Defense, delivering cutting-edge projects that make a real impact. Dive into exciting opportunities in Cybersecurity, IT, Data Analytics and more. Propel your career forward and be part of something extraordinary. Your journey starts now—protect and innovate with MANTECH! MANTECH seeks a motivated, career and customer-oriented Senior Information Systems Security Engineer to join our team working in Crane, IN. This is an onsite position. Responsibilities include but are not limited to: Systematically integrates security functional requirements into system acquisition, engineering, and development phases. Harden application interfaces, data repositories, and cloud environments using systems engineering methodologies. Prepare, review, and maintain system security documentation under the Risk Management Framework (RMF), including SSPs, SAPs, SARs, and POA&Ms. Support system certification activities to secure and maintain an Interim Authority to Test (IATT) and Authority to Operate (ATO). Acts as the primary technical security advisor/SME to Government stakeholders, program managers, and system engineering teams. Lead technical walkthroughs, security reviews, and participates in intelligence-community or industry-based technical working groups. Conduct threat modeling, vulnerability assessments, and analyzes security logs to proactively harden defenses against adversaries. Provide technical expertise to contain and mitigate real or potential system security incidents. Design and architect robust end-to-end security solutions for networks, databases, and enterprise systems. Incorporate Zero Trust principles, boundary protection, firewalls, and cryptographic controls to safeguard critical warfighting infrastructure. Minimum Qualifications: Bachelors degree in Information Security, Systems Engineering or a related technical discipline or, a High School Diploma and 4+ additional years of experience as described above in lieu of degree 10+ years of progressive experience in system engineering, information assurance, or cybersecurity Must possess a SecurityX (previously known as CASP+) or CISSP certification Preferred Qualifications: Master’s degree in Computer Science, Computer Engineering, or related technical field Clearance Requirements: U.S. Citizenship required and a current or active Secret clearance or ability to obtain an Interim Secret clearance prior to starting. 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, and or virtual communication, which may involve delivering presentations. MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation. If you need a reasonable accommodation to apply for a position with MANTECH, please email us at and provide your name and contact information.