Part-Time Senior Systems Administrator; CMMC​/GCC LLC

Location: Manassas, VA (Hybrid / On-site as needed)
Engagement Type: Part-Time, 1099 Independent Contractor
Clearance: Active Secret preferred

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Aardvark is a HUBZone certified and service disabled veteran-owned small business supporting national security, missile defense, and space-domain programs across DoD and IC customers. We operate in regulated environments where security, reliability, and compliance are mission-critical, not check-the-box exercises. We’re looking for a senior-level systems administrator who can own our IT environment end-to-end and help us maintain and mature CMMC / NIST 800-171 compliance

This role is ideal for a seasoned Senior Systems Administrator / IT Security Engineer who is comfortable operating independently, understands DoD compliance requirements, and can serve as the technical backbone for a growing cleared organization.

You will be responsible for administering and securing our Microsoft GCC High tenant
, managing endpoints and identities, enforcing STIG-based configurations, and supporting our Dev Sec Ops  toolchain. You’ll also play a key role in ongoing CMMC readiness and audit support.

Security & Compliance

• Administer and maintain compliance with NIST SP 800-171 and evolving CMMC requirements

• Implement and enforce STIG-based system hardening across endpoints and servers

• Maintain system security documentation (SSP inputs, POA&M support, evidence artifacts)

• Support internal audits, assessments, and third-party reviews

• Coordinate with leadership on security posture, risk, and remediation priorities

Microsoft GCC High / Identity

• Serve as GCC High Administrator (Azure AD / Entra , Exchange Online, Intune)

• Manage user accounts, RBAC, conditional access, MFA, and privileged access

• Configure and enforce compliance policies using Microsoft Intune

• Push security baselines, updates, and configuration changes via Intune

Endpoint & Device Management

• Device enrollment and lifecycle management (Windows primarily)

• Ensure endpoints meet DoD security standards and organizational baselines

• Manage patching, updates, and configuration drift

• Oversee secure handling of laptops, removable media, and peripherals

Dev Sec Ops  Tooling

• Administer and maintain:

  • Git Lab (access control, repo security, CI/CD permissions)

  • Jira (project permissions, workflows)

  • Confluence (access control, documentation governance)

• Enforce least-privilege access and secure collaboration practices

Infrastructure & Systems

• Manage GPIOs / hardware interfaces as required for lab or development systems

• Monitor system health, backups, and logs

• Troubleshoot security, access, and system issues as they arise

• Minimum Security+ (CISSP Preferred)

• 10+ years experience as a Systems Administrator or IT Security Engineer

• Hands‑on experience administering Microsoft GCC High environments

• Strong working knowledge of NIST SP 800-171 and CMMC practices

• Experience with
  Intune
  , endpoint compliance, and STIG enforcement

• Familiarity with Git Lab, Jira, and Confluence administration

• Comfortable operating in regulated, cleared environments

• Ability to work independently and communicate clearly with leadership

• Active Secret or TS/SCI clearance (or eligibility)

• Prior experience supporting CMMC Level 2 readiness

• Experience with DFARS, DoD RMF, or IC environments

• Security certifications (Security+, CISSP, CISM, etc.)

• Familiarity with Azure Gov Cloud integrations

• Part-time, flexible hours

• 1099 contractor role

• On-site presence in Manassas, VA as needed (not fully remote)

• Competitive hourly rate, commensurate with experience

• High trust, high impact position

• Direct access to leadership and decision-making

• Opportunity to shape security and IT practices from the ground up

• Meaningful work supporting national security missions