Senior IT Systems Administrator

Position

Senior IT Systems Administrator

Centennial, Colorado

Active TS/SCI

Grey Matters Defense Solutions, LLC is a specialized firm in software development, data analytics algorithms, and advanced remote sensing technologies, tailored to meet the complex demands of defense and intelligence sectors. Staffed by a diverse range of professionals—from senior‑level experts from organizations like the Defense Intelligence Agency (DIA), National Reconnaissance Office (NRO), Defense Advanced Research Projects Agency (DARPA), and the U.S. Armed Forces, to recent graduates and military recruits—Grey Matters Defense Solutions, LLC delivers unique artificial intelligence algorithms and applications, positioning itself as a leader in innovative solutions for defense and intelligence.

Grey Matters Defense Solutions, LLC seeks a Senior IT Systems Administrator to lead our classified and unclassified network infrastructure serving defense contracting operations. This role requires deep expertise in government cloud environments, security compliance frameworks, and enterprise systems architecture.

• Expert‑level Microsoft 365 GCC High administration, architecture, and governance
• Advanced Windows Server and enterprise desktop administration
• CMMC (Cybersecurity Maturity Model Certification) Level 2+ compliance implementation and program management
• Enterprise network architecture and administration including TCP/IP, DNS, DHCP, VPN, firewall management, and security segmentation
• Active Directory and Group Policy design and implementation
• Security baseline development, implementation, and continuous monitoring

• 10+ years in IT systems administration with increasing responsibility
• 5+ years in defense contracting or government environments
• Proven experience leading DoD compliance frameworks (NIST 800‑171, DFARS, CMMC)
• Track record managing complex security controls and successful compliance audits
• Experience developing and maintaining System Security Plans (SSPs) and other compliance documentation

• Active clearance or ability to obtain and maintain TS/SCI
• U.S. Citizenship required

• Linux system administration and architecture (Red Hat/CentOS/Ubuntu)
• AWS cloud infrastructure design and administration
• SCIF (Sensitive Compartmented Information Facility) networking, accreditation, and operations
• Extensive experience with classified network environments and cross‑domain solutions
• Professional certifications (Security+, CISSP, CCSP, MCSE, CCNP)
• Git Lab CI/CD pipeline administration and Dev Sec Ops  practices
• Experience with MSSP vendor management and service integration

• Lead Microsoft 365 GCC High environment architecture, administration, and optimization
• Drive CMMC Level 2 compliance program including assessment readiness and continuous improvement
• Architect and manage Windows server infrastructure and enterprise services
• Design and maintain secure network architecture across classified and unclassified environments
• Develop and enforce security policies, procedures, and technical standards
• Lead incident response, security monitoring, and vulnerability management programs
• Manage vendor relationships and evaluate technology solutions
• Plan and execute infrastructure projects and technology roadmap initiatives
• Support strategic IT planning and budget development
• Manage IT asset inventory and lifecycle including laptops, workstations, peripherals, and network equipment
• Perform physical installation and configuration of hardware systems and network infrastructure

$105,000 - $175,000 + 25% Employer funded SEP IRA distributed monthly

Grey Matters Defense Solutions, LLC offers a comprehensive benefits package including medical, dental, vision, life insurance, short‑term and long‑term disability.
25% (of salary) employer contribution distributed monthly to your SEP IRA
Individual Benefit Account 25% (of salary to pay for medical insurance premiums and funded time off)
Employee assistance program
Employee discount
Health savings account
Referral program

Questions contact: jenny.ros

All qualified applicants will receive consideration for employment regardless of race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.

Grey Matters Defense Solutions, LLC participates in E‑Verify. Federal law requires all employers to verify the identity and employment eligibility of all persons hired to work in the United States.

Grey Matters Defense Solutions, LLC complies with the Colorado Artificial Intelligence Act (CAIA) and maintains policies, controls, and oversight practices designed to mitigate algorithmic discrimination, promote transparency, and ensure responsible use of AI systems in accordance with Colorado law.