Note: The job is a remote job and is open to candidates in USA. C3 Integrated Solutions is a market leader in helping the Defense Industrial Base navigate cybersecurity and compliance requirements. The Senior Systems Administrator will focus on maintaining, monitoring, securing, and optimizing IT environments across multiple managed client environments, ensuring operational stability and security compliance.

Responsibilities

• Maintain and monitor technical security controls aligned with CMMC Level 2 / NIST SP 800-171
• Operate and maintain Microsoft cloud and identity services: Microsoft 365, Azure/Azure Gov, Entra ID, Exchange Online, SharePoint, Teams
• Own Intune device management: device enrollment, configuration profiles, compliance policies, baselines, patching coordination, and device lifecycle
• Administer and support Azure Virtual Desktop (AVD): host pools, images, session host health, user access, performance troubleshooting
• Use/support Nerdio to deploy/scale/optimize AVD and manage cost/performance controls
• Support Zscaler secure access workflows: client connectivity issues, policy-related access troubleshooting, and secure remote access support
• Respond to monitoring alerts, troubleshoot complex issues (cloud, server, endpoint, network), and prevent repeat incidents via RCA and remediation
• Maintain clear, audit-ready documentation (configs, changes, procedures, evidence support) appropriate for regulated environments
• Mentor Systems Administrators and Service Desk team members, providing escalation support and technical guidance
• Collaborate closely with TAMs, SOC, Compliance, and Managed Services leadership
• Participate in rotation-based, emergency-only on-call support

Skills

• 5+ years Systems Administration experience, including 2+ years in an MSP or multi-client environment
• Strong administration experience with Microsoft 365 (GCC High / Azure Gov preferred)
• Hands-on Intune device management experience (policies, compliance, profiles, baseline enforcement)
• Hands-on AVD experience; Nerdio experience strongly preferred
• Experience supporting Zscaler or similar secure access / Zero Trust platforms
• Strong fundamentals in AD, DNS, DHCP, Group Policy, Windows Server, and troubleshooting authentication/device issues
• Security operations familiarity: EDR, log review, alert triage workflows, and vulnerability remediation support (partnering with SOC as applicable)
• Strong troubleshooting and documentation skills with a security-first mindset
• Ability to communicate technical and compliance-related concepts to non-technical stakeholders
• Solid networking fundamentals (TCP/IP, VPNs, firewalls, VLANs) and PowerShell for administration/automation
• Strong written communication and disciplined documentation practices
• Experience supporting defense contractors or DoD-regulated environments
• Familiarity with RMM and PSA tools
• ITIL Foundation or practical ITIL framework knowledge
• CMMC RP/CCP, Security+, CySA+, CISSP, or Microsoft certifications
• Active DoD Secret/TS clearance (preferred, not required)

Benefits

• Remote work opportunities
• Medical, Dental, Vision Insurance
• Four Weeks of Paid Time Off (vacation & sick leave)
• Four weeks of Paid Maternity and Paternity leave
• Two days of Paid Volunteer Time
• 401(k) with 4% Company Match
• Company Bonus Structure
• Tuition Reimbursement
• Employer-sponsored Disability & Life Insurance
• Professional Development

Company Overview