Senior Information Systems Security Engineer
Last confirmed open Oct 26, 2026
Before you apply
- Top Secret clearance
- An active clearance is required to start.
- Polygraph required
- The posting asks for a polygraph without saying which kind.
- No degree required
- A high school diploma or GED is enough.
- CISSP, CompTIA CASP+, CISM
- Certifications the posting names.
MANTECH seeks a motivated, career and customer-oriented **Senior** **Information System Security Engineer (ISSE)** to join our team in **Huntsville, AL.**
**Responsibilities include, but are not limited to:**
+ 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, recommending enhancements to strengthen 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
+ Provide rapid response to data calls, RFIs, and leadership inquiries, including escalation and reporting of high-risk or non-compliant remediation actions
**Minimum Qualifications:**
+ Must meet one of the following levels of experience: A high school diploma/GED and 14 years’ experience, an Associate’s degree and 10 years’ experience, a Bachelors degree and 8 years’ experience, or a Master’s and 6 years’ experience.
+ Hold at least one of the following certifications: Certified Information Systems Security Professional (CISSP) (or Associate), CompTIA Advanced Security Practitioner (CASP) CE, Certified Secure Software Lifecycle Professional (CSSLP), CISSP- Information System Security Engineering Professional (ISSEP), Certified Information Security Manager (CISM), or CISSP- Information System Security Architecture Professional (ISSAP).
+ Familiarity with the use and operation of security tools including: Tenable Nessus and/or Security Center, IBM Guardium, HP WeblInspect, Network Mapper (NMAP), and/or similar applications.
+ Working knowledge of the National Institute of Standards and Technology (NIST) Risk Management Framework (RMF) and ATO processes.
+ Experience with vulnerability management programs, including identification, tracking, and remediation of 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 Risk Management Framework (RMF), POA&M tracking, and governance, risk, and compliance (GRC) tools.
**Preferred Qualifications:**
+ Degree in Computer Science, Cybersecurity, or other 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.
**Security Clearance Requirements:**
+ Must have an active TOP SECRET security clearance and be willing and able to obtain SCI eligibility prior to start.
+ Selected candidate must be willing to undergo a Polygraph.
**Physical Requirements:**
+ Must be able to remain in a stationary position 50%
+ Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.
+ Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer
+ Often positions self to maintain computers in the lab, including under the desks and in the server closet
+ Frequently communicates with co-workers, management and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations
MANTECH International Corporation 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 [email protected] and provide your name and contact information.
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