Senior Information Systems Security Engineer

MANTECH • Huntsville, AL

1d • Onsite

About The Position

MANTECH seeks a motivated, career- and customer-oriented Senior Information System Security Engineer (ISSE) to join its team in Huntsville, Alabama. The role supports government intelligence agencies and focuses on cybersecurity requirements, secure architectures, vulnerability management, and compliance across information systems and network environments. The position is onsite and requires an active Top Secret clearance, with willingness and ability to obtain SCI eligibility before starting, as well as willingness to undergo a polygraph.

Requirements

• Meet one of the following education and experience combinations: high school diploma/GED and 14 years of experience; associate degree and 10 years; bachelor's degree and 8 years; or master's degree and 6 years.
• Hold at least one of the following certifications: CISSP or Associate of CISSP; CompTIA CASP CE; CSSLP; CISSP-ISSEP; CISM; or CISSP-ISSAP.
• Familiarity with security tools such as Tenable Nessus and/or Security Center, IBM Guardium, HP WebInspect, NMAP, or similar applications.
• Working knowledge of the NIST Risk Management Framework (RMF) and ATO processes.
• Experience with vulnerability management programs, including identifying, tracking, and remediating CVEs and Known Exploited Vulnerabilities (KEVs).
• Knowledge of federal cybersecurity directives and frameworks, including CISA Emergency Directives (EDs), Binding Operational Directives (BODs), and DOJ Vulnerability Patch Requirements (VPRs).
• Experience with RMF, POA&M tracking, and governance, risk, and compliance (GRC) tools.
• Active Top Secret security clearance and willingness and ability to obtain SCI eligibility before starting.
• Willingness to undergo a polygraph.
• Ability to remain stationary for 50% of the time; occasionally move around the office; operate a computer and other office productivity machinery; and position oneself to maintain computers in a lab, including under desks and in a server closet.
• Ability to communicate frequently with coworkers, management, and customers, including delivering presentations and exchanging accurate information.

Nice To Haves

• Degree in Computer Science, Cybersecurity, or another cyber discipline.
• Ability to operate in high-tempo environments with rapid response requirements and strict deadlines.
• Strong organizational and process improvement skills to support reporting, tracking, and compliance initiatives.

Responsibilities

• Define and implement cybersecurity requirements, architectures, and secure system designs across information systems and network environments.
• Design, develop, and integrate security solutions, including Cross Domain Solutions (CDS), to support secure data flow and system interoperability.
• Implement network security controls and countermeasures to ensure confidentiality, integrity, availability, authentication, and non-repudiation.
• Identify, assess, and mitigate system and network vulnerabilities, and recommend enhancements to strengthen the overall security posture.
• Maintain and track vulnerability data, POA&Ms, and remediation activities using GRC and enterprise tracking tools.
• Lead stakeholder engagement through office hours, guidance, and updated procedures to support vulnerability management and compliance efforts.
• Respond rapidly to data calls, RFIs, and leadership inquiries, including escalating and reporting high-risk or non-compliant remediation actions.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: High school or GED