Information Systems Security Engineer

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 Information Systems Security Engineer to join our team working in Crane, IN. This is an onsite position.

Responsibilities include but are not limited to:

• Leads the development, update, and submission of the RMF packages inside government repositories (e.g., eMASS).
• Conducts security control assessments, draft Plans of Action and Milestones (POA&Ms), and maintains system continuous monitoring strategies.
• Performs automated and manual vulnerability assessments using tools like ACAS (Nessus) and SCAP.
• Translates findings into action by applying Defense Information Systems Agency (DISA) Security Technical Implementation Guides (STIGs) and resolving compliance gaps.
• Serves as the primary bridge between the software development/systems engineering team and the Information System Security Manager (ISSM).
• Participates in engineering change boards to ensure modifications do not compromise system posture.
• Assists in analyzing security logs, detecting anomalies, and providing system-level technical support during incident response or forensic investigations.
• Applies system security engineering principles to implement secure designs, secure configurations, and boundary defenses (firewalls, IDS/IPS, access controls).
• Ensures standard security tools (e.g., HBSS/ESS, ACAS, SIEM) are properly integrated

Minimum Qualifications:

• 5+ years of direct experience in cybersecurity engineering, systems engineering, or network administration

• Bachelor's degree in Computer Science, Information Assurance, System Engineering, or a related technical discipline. 6+ years of additional experience may substitute for the degree requirements

• Must possess a CompTIA Security+ certification

Preferred Qualifications:

• Master’s degree in Computer Science, Computer Engineering, or related technical field

• Active DoD 8570.01-M / DoD 8140 IAT Level III baseline certification (e.g., CISSP, CASP+ CE, or CISA)

• Previous experience working in a DoD environment

Clearance Requirements:

• U.S. Citizenship required and an active or current Secret clearance or ability to obtain an Interim Secret prior to starting.

Physical Requirements:

• The person in this position must be able to remain in a stationary position 80% 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 careers@mantech.com and provide your name and contact information.

General information

Requisition #

R71038

Locations

USA-IN-Crane

Posting Date

09/30/2026

Security Clearance Required

Interim Secret

Remote Type

Onsite

Time Type

Full time