Senior IT Systems Administrator: Secure Cloud & RMF

Noblis, Inc.; Chantilly (VA); On-site; USD 100,000 - 228,000; Full time

Job summary

Noblis ESI seeks experienced IT Systems Administrators specializing in cloud services for classified SCIF environments. You will apply RMF and ICD-503 controls to maintain secure, highly available infrastructure across C2S and on-premises systems.

You will provide Tier II/III engineering support, enforce NIST SP 800-53 controls, manage MFA with RSA tokens, and monitor compliance using ACAS, Nessus, and Splunk in high-security settings. Some travel is required.

Qualifications

• Active Top Secret/SCI clearance with CI Polygraph.
• US Citizenship required.
• Degree in Cybersecurity, IT, CS or equivalent.
• DoD 8570/8140 IAM/IAT Level II or III certification required.
• Experience administering ACAS, Nessus, or Splunk vulnerability and logging scanners.
• Deep RMF lifecycle and ICD-503 security accreditation knowledge.
• Design and maintain secure, scalable C2S infrastructure using AWS Well-Architected.

Responsibilities

• Support classified C2S infrastructures across domains; seek efficiencies and high availability.
• Provide 100% on-site management of secure server and desktop infrastructure in classified space.
• Diagnose and resolve complex infrastructure and network failures; handle outages and changes.
• Implement, monitor and enforce security controls per NIST SP 800-53, RMF, ICD 503.
• Administer on-premises servers synchronized with classified cloud environments.
• Utilize RSA MFA to enforce secure remote access and MFA-based authentication.
• Configure and monitor continuous auditing via Splunk for compliance.
• Perform system scans (Nessus/ACAS) and remediate findings.

Skills

Top Secret/SCI clearance

US Citizenship

RMF/ICD-503 knowledge

C2S AWS infrastructure

PowerShell or Python

AD / GPOs

Education

Bachelor's degree in Cybersecurity/IT/CS or equivalent

DoD 8570/8140 IAM/IAT Level II/III certification

Tools

ACAS

Nessus

Splunk

Active Directory

GPOs

RSA MFA

AWS Well-Architected Framework

STIGs / CIS Benchmarks

Job description

Noblis ESI seeks experienced IT Systems Administrators specializing in cloud services for classified SCIF environments. You will apply RMF and ICD-503 controls to maintain secure, highly available infrastructure across C2S and on-premises systems.

You will provide Tier II/III engineering support, enforce NIST SP 800-53 controls, manage MFA with RSA tokens, and monitor compliance using ACAS, Nessus, and Splunk in high-security settings. Some travel is required.