Information System Security Engineer (ISSE)

Information Systems Security Engineer (ISSE) – TS/SCI Full Scope Poly

Location: Maryland
Work Arrangement: 100% Onsite
Employment Type: Full-Time
Security Clearance: Active TS/SCI with Full Scope Polygraph
Citizenship: U.S. Citizenship Required
Certification: DoD 8570/8140 IASAE Level II Compliant Certification Required
Salary: $100,000–$200,000

Position Overview

We are seeking an experienced Information Systems Security Engineer (ISSE) to support mission-critical Government programs in complex classified environments.

The ISSE will apply cybersecurity engineering principles throughout system design, implementation, accreditation, and sustainment. This position will support the full Risk Management Framework (RMF) lifecycle, Assessment & Authorization (A&A) activities, Authority to Operate (ATO) maintenance, security control implementation, vulnerability management, and continuous cybersecurity compliance.

The successful candidate will work closely with ISSOs, ISSMs, Security Control Assessors (SCAs), system administrators, and system owners to maintain the security and compliance of mission-critical systems.

Required Qualifications

• Active TS/SCI with Full Scope Polygraph security clearance.

• NSA Full Scope Polygraph required.

• U.S. Citizenship required.

• DoD 8570/8140 IASAE Level II compliant certification required.

• Strong understanding of the Risk Management Framework (RMF) .

• Experience supporting Assessment & Authorization (A&A) and Authority to Operate (ATO) processes.

• Experience implementing, assessing, and validating security controls.

• Experience supporting continuous monitoring and cybersecurity compliance activities.

• Familiarity with NIST SP 800-37 .

• Familiarity with NIST SP 800-53 , Rev. 3 and/or Rev. 5.

• Experience with RMF and cybersecurity tools such as:

  • LATTEART

  • XACTA

  • BISCOTTI

  • WATCHCAT

  • STE

• Experience with compliance and configuration scanning tools.

• Strong analytical, troubleshooting, and technical documentation skills.

Technical Responsibilities

• Support the full RMF lifecycle for classified systems.

• Assist with A&A package development and ATO maintenance.

• Implement, assess, and validate security controls.

• Perform security control traceability and technical validation.

• Support system boundary definition and security architecture documentation.

• Develop and maintain RMF artifacts and bodies of evidence.

• Conduct compliance and vulnerability scanning analysis.

• Validate findings, including false-positive identification and remediation verification.

• Support STIG implementation and configuration hardening.

• Manage patch validation and security compliance activities.

• Participate in Continuous Monitoring (ConMon) activities.

• Support technical security assessments and risk analysis.

• Track vulnerability remediation and cybersecurity compliance activities.

Core ISSE Skill Areas

• Assessment & Authorization (A&A)

• Risk Management Framework (RMF)

• Authority to Operate (ATO)

• Security control implementation and validation

• RMF documentation and artifact development

• System boundary definition and security architecture

• Vulnerability management and remediation tracking

• STIG implementation and compliance validation

• Technical security assessment and risk analysis

• Continuous Monitoring (ConMon)

Preferred Qualifications

• Experience working in classified Government cybersecurity environments.

• Familiarity with enterprise Linux, network, or cloud systems.

• Experience working with ISSOs, ISSMs, SCAs, and System Owners.

• Understanding of vulnerability management and cybersecurity automation tools.

• Experience supporting large-scale enterprise or mission-critical systems.

IASAE Level II Certification Examples

Acceptable certifications include:

• CISSP

• CASP+

• CCSP

• CSSLP

Benefits

• 3 Weeks Paid Time Off

• 11 Federal Holidays

• Medical and Dental Coverage

• Short-Term Disability (STD)

• Long-Term Disability (LTD)

• Life Insurance

• AD&D Coverage

• 401(k) with up to 4% Company Match

• Relocation Assistance Available

Additional Information

100% onsite in Maryland.

Full Scope Polygraph from the NSA is required. Candidates with a polygraph within the last 7 years are preferred, although candidates with older polygraphs may be considered based on skill level and program requirements.

U.S. Citizenship is required. Visa sponsorship is not available.

We are an Equal Opportunity Employer committed to technical excellence, collaboration, and professional growth.