DoD Cybersecurity Engineer - RMF/A&A Specialist, TS/SCI

SAIC; St. Louis (MO); On-site; USD 120,000 - 150,000; Full time

Job summary

SAIC is seeking a Cyber Security Engineer to support critical DoD and Intelligence Community missions in St. Louis.

You will lead RMF assessment and authorization, vulnerability management, and secure operations for classified systems, coordinating with DevSecOps and engineering teams to maintain compliance and incident readiness. Role requires TS/SCI clearance with polygraph, a bachelor’s degree plus 5 years of experience (or equivalent), and hands-on RMF/ATO documentation in XACTA/eMASS.

Qualifications

• Active TS/SCI clearance; willing to pass polygraph.
• Bachelor's degree plus 5 years of experience (or equivalent).
• Hands-on RMF, POA&Ms, ATO documentation experience.
• Experience with ACAS and IAVM tracking.
• Knowledge of STIGs, patching, and system hardening.
• Familiarity with NIST publications and incident-response processes.
• Strong analytical and communication skills.

Responsibilities

• Execute RMF processes for Assessment & Authorization (A&A).
• Develop/maintain SSPs, POA&Ms, SARs, and ATO artifacts in XACTA/eMASS.
• Conduct vulnerability scanning and track remediation using ACAS/IAVM.
• Implement and validate NIST 800‑53 and CNSSI 1253 controls.
• Support hardening, patching, STIG compliance for Windows, Linux, and networks.
• Monitor systems and assist with incident response.
• Evaluate security impacts of system changes.
• Collaborate with engineering, administration, and DevSecOps teams.

Skills

Analytical skills

Communication skills

Scripting experience

Education

Bachelor’s degree

Tools

Jira

Confluence

ACAS/IAVM tracking

XACTA

eMASS

Job description

SAIC is seeking a Cyber Security Engineer to support critical DoD and Intelligence Community missions in St. Louis.

You will lead RMF assessment and authorization, vulnerability management, and secure operations for classified systems, coordinating with DevSecOps and engineering teams to maintain compliance and incident readiness. Role requires TS/SCI clearance with polygraph, a bachelor’s degree plus 5 years of experience (or equivalent), and hands-on RMF/ATO documentation in XACTA/eMASS.