Senior ISSE & RMF Cybersecurity Architect

Sabre Systems; Patuxent Highland (MD); Hybrid; USD 160,000 - 190,000; Full time

Job summary

Sabre Systems seeks a Principal Cybersecurity Engineer to provide senior‑level ISSE support for a federal cybersecurity program operating under the RMF. You will guide cybersecurity architecture, compliance, threat analysis, and continuous monitoring while delivering high‑quality documentation and executive‑level deliverables.

The role requires advanced engineering expertise in information systems, OT, and hybrid cyber‑physical platforms, with hybrid work in the NCR and on-site presence for

Qualifications

• Nine years of progressive cybersecurity engineering/ISSE experience.
• Experience executing the RMF lifecycle with control implementation, assessment, and monitoring.
• Active DoD Secret Clearance or higher; U.S. citizen.

Responsibilities

• Serve as the lead ISSE for assigned information systems, OT environments, and hybrid cyber-physical platforms.
• Lead or support the full RMF lifecycle—from categorization and control selection through assessment, authorization, continuous monitoring, and decommissioning.
• Develop, update, and maintain RMF documentation in eMASS, including SSPs, SCTMs, POA&Ms, SARs, contingency/incident response plans, risk analyses, inventories, diagrams, and data flows.
• Conduct Security Readiness Reviews; analyze ACAS/Nessus data; validate remediation and coordinate DISA ticket actions.
• Support ongoing compliance with DoD, DHS, USCG, and DISA STIG requirements; contribute to cATO efforts, automated evidence gathering, and dashboard integration.
• Perform Security Impact Assessments and participate in engineering reviews, change control boards, acquisition milestones, and technical working groups.
• Integrate Zero Trust principles, RMF control requirements, and OT/ICS security considerations into system engineering and architecture.
• Evaluate cyber threats, adversary TTPs, OT/ICS vulnerabilities, and supply-chain risks; recommend mitigation strategies and system hardening approaches.
• Track compliance with authoritative orders (OPORDs, TASKORDs, FRAGOs, ALCOASTs, TCTOs).
• Produce cybersecurity readiness updates, briefings, metrics, and risk memorandums; respond to Government data calls as needed.
• Provide mentorship and technical leadership to junior cybersecurity team members and provide recommendations to improve processes and contract operations.

Skills

ISSE leadership

RMF lifecycle

Threat analysis

Executive briefings

Cybersecurity engineering

Communication

Education

Bachelor’s degree in Computer Science, Cybersecurity, Information Technology, Engineering

Tools

eMASS

ACAS/Nessus

HBSS

Tanium

Elastic SIEM

Splunk

ServiceNow

Burp Suite

Job description

Sabre Systems seeks a Principal Cybersecurity Engineer to provide senior‑level ISSE support for a federal cybersecurity program operating under the RMF. You will guide cybersecurity architecture, compliance, threat analysis, and continuous monitoring while delivering high‑quality documentation and executive‑level deliverables.

The role requires advanced engineering expertise in information systems, OT, and hybrid cyber‑physical platforms, with hybrid work in the NCR and on-site presence for