Senior IT Systems Engineer - Secure Cloud & RMF

Arcfield; Chantilly (VA); On-site; USD 123,000 - 214,000; Full time

Job summary

Arcfield is seeking an experienced IT Systems Engineer/Administrator specializing in cloud services to support classified SCIF environments. You will optimize and secure on-site and hybrid infrastructures, delivering Tier II/III engineering, and ensuring RMF/ICD-503 compliance for critical communications and authentication platforms.

You will deploy secure endpoints, manage MFA and identity access, and perform vulnerability assessments with Nessus, ACAS, and Splunk.

Qualifications

• Must possess TS/SCI with Poly and be a US citizen.
• Bachelor's degree with 5+ years IC/DoD experience or advanced degrees with experience.
• Experience administering security tools and RMF/ICD-503 compliance.
• Proficient in secure baseline implementation and patch management.
• Experience with classified on-prem and cloud (C2S) infrastructure.

Responsibilities

• Provide 100% on-site management of secure server & desktop infrastructure in classified space.
• Support classified Cloud Infrastructure and Architecture across C2S domains.
• Diagnose and resolve complex infrastructure, server, and network failures (Tier II/III).
• Handle limited Tier I desktop/user issue escalations.
• Implement and enforce security controls per RMF/ICD-503 and NIST SP 800-53.
• Administer hybrid infrastructure, syncing on-prem with cloud environments.
• Deploy secure endpoints, enforce baselines, push patches via Microsoft tools.
• Manage Identity & Access with MFA and remote access.
• Configure and monitor auditing/logging (e.g., Splunk).
• Assist with strategic system design changes to maintain security and usability.

Skills

TS/SCI with Poly

Cloud security

RMF & ICD-503

Active Directory

PowerShell/Python

Networking (VPCs, Route53)

Security compliance

Tier II/III support

Education

Bachelor's degree in Cybersecurity/IT/CS

Master's degree

PhD

Associate's degree

Tools

ACAS

Nessus

Splunk

AWS Well-Architected

PowerShell

Python

Job description

Arcfield is seeking an experienced IT Systems Engineer/Administrator specializing in cloud services to support classified SCIF environments. You will optimize and secure on-site and hybrid infrastructures, delivering Tier II/III engineering, and ensuring RMF/ICD-503 compliance for critical communications and authentication platforms.

You will deploy secure endpoints, manage MFA and identity access, and perform vulnerability assessments with Nessus, ACAS, and Splunk.