Lead Information Systems Security Engineer (ISSE) - TS/SCI with Polygraph

Description

The company is a global technology and professional services firm that supplies technology and mission services to federal civilian agencies, the defense sector and the intelligence community.

The role sits in the cyber and IT risk management job family and centres on security accreditation for large government systems.

The team works across 50+ countries with about 26,000 staff, and the work covers AI, cloud, cyber and software development.

Responsibilities

• Lead security accreditation work and guide ISSMs, SCAs, PMs and engineers through the full RMF and ICD 503 lifecycle.
• Move systems through ATD, then IATT, then ATO, making sure technical and documentation requirements are met at each stage.
• Serve as the main contact for customer security organizations, audit teams and senior leaders.
• Mentor junior engineers and oversee technical work across several projects.
• Review system architectures in depth and document the security-relevant parts for SSPs and CONOPS.
• Lead writing, review and delivery of RMF and ICD 503 documents, including SSPs, CONOPS, contingency plans, user guides and SOPs.
• Review and update control volatility assessments as threats, IC policy, federal standards and system sensitivity change.
• Support continuous monitoring (ISCM) by reviewing technical content and suggesting improvements.
• Track A&A progress across several systems and report it to customer leadership.
• Own POA&M creation and mitigation plans, and collect evidence from system owners and engineers.
• Act as audit liaison for internal and external audits, giving short, practical recommendations.
• Keep systems compliant through ongoing security oversight and risk assessments.

Requirements

• 10+ years of cybersecurity, information assurance or security engineering experience, with technical training, a certification or a degree.
• Hold DoD Manual 8570.01-M IASAE Level II certification for the IA System Architect and Engineer role.
• Experience mentoring or leading security teams.
• Hands-on experience leading A&A and ATO efforts for large or complex systems.
• Deep command of RMF, ICD 503 and IC accreditation processes.
• Strong technical writing, especially for SSPs, CONOPS, POA&Ms and audit documents.
• Skill in turning complex engineering details into security artifacts and briefings.
• Knowledge of information system security, POA&M management and risk assessments.
• US citizenship is required.
• Preferred: experience supporting DoW or Intelligence Community customers.
• Preferred: background in secure systems architecture or engineering.
• Preferred: familiarity with high-value assets, cross-domain systems or TS/SCI mission systems.
• Preferred: experience leading A&A for Special Access Programs.

Conditions

Onsite at a customer site in Washington, DC, with no travel required.

Full-time, 40 scheduled hours per week, in a regular position.

Must currently hold an active TS/SCI clearance with polygraph, or be able to obtain one.

No public trust or other clearance is required.

The likely salary is $164,382 to $207,000, set by experience, location and possibly contract terms, and may fall outside that range. It is not a guaranteed figure.

Hiring includes an identity check using biometrics and AI, and you must be on camera for virtual interviews.

Equal opportunity employer, including individuals with disabilities and protected veterans.

Benefits

• 401(k) plan with company match.
• Broad health and wellness coverage.
• Internal mobility support to build skills and steer your career.
• Paid education and certifications.
• Access to current technology to learn from.
• Paid vacation and 10 company-paid holidays.