ISSE: Mission-Critical Security Architect (On-Site)

SAIC; Springfield (VA); On-site; USD 80,000 - 120,000; Full time

Job summary

SAIC is seeking an experienced Information Systems Security Engineer (ISSE) to support the MAJESTIC Joint Program Office by performing advanced security engineering and architectural design for mission-critical IT systems. The ISSE will lead the design, development, implementation, and validation of security architectures across the full lifecycle and ensure RMF and NIST controls are integrated.

The role requires on-site work in Springfield, VA, collaboration with leadership, ISSMs/ISSOs,

Qualifications

• High School diploma or GED.
• 2–5 years of professional IT security experience.
• Must meet Cybersecurity Workforce Framework (CWF) ID652 or ID633 requirements or possess one or more of listed certifications.

Responsibilities

• Design and engineer secure system architectures, integrating RMF and mission requirements.
• Translate security requirements into technical specifications, models, and design artifacts.
• Select, implement, and validate security controls and technical mitigations.
• Integrate security into system diagrams, data flows, and high-/low-level designs.
• Engineer core security solutions (boundary protection, encryption, IAM, auditing, secure configs).
• Embed security across the full system lifecycle—requirements through sustainment.
• Develop and maintain A&A documentation and support ATO evidence.
• Test and verify security controls across applications, platforms, and networks.
• Conduct risk assessments, threat modeling, and vulnerability analysis; recommend mitigations.
• Assess security impacts of system changes, upgrades, and new integrations.
• Apply DISA STIGs, CIS Benchmarks, and maintain hardened configuration baselines.
• Design monitoring architectures for SIEM, detection rules, and audit/log collection.
• Support incident response with architectural forensics and remediation guidance.
• Collaborate with developers, integrators, administrators, and cybersecurity teams.
• Present security engineering findings and architecture recommendations to leadership.
• Produce technical documentation, diagrams, reports, SOPs, and design artifacts.

Skills

Security architecture

Secure system design

Engineering principles

SSP documents

Security diagrams

Control implementation

Risk assessments

Technical writing

Threat modeling

Vulnerability analysis

Education

High School diploma / GED

Tools

Nessus

ACAS

Qualys

Splunk

SIEM

Job description

SAIC is seeking an experienced Information Systems Security Engineer (ISSE) to support the MAJESTIC Joint Program Office by performing advanced security engineering and architectural design for mission-critical IT systems. The ISSE will lead the design, development, implementation, and validation of security architectures across the full lifecycle and ensure RMF and NIST controls are integrated.

The role requires on-site work in Springfield, VA, collaboration with leadership, ISSMs/ISSOs,