Senior Systems Administrator

C3 Integrated Solutions

7h•Remote

About The Position

C3 Integrated Solutions is a market leader in helping the Defense Industrial Base (DIB) navigate cybersecurity and compliance requirements, including CMMC, NIST 800-171, and GCC High. Backed by private equity and having recently merged with Ingalls Information Security, C3 is in an exciting period of rapid growth and innovation. We partner with organizations across the defense supply chain to secure their operations and position them for long-term success in a highly regulated environment. With the final CMMC rule now in effect and demand surging across the industry, this is a pivotal moment to join our team. You'll be at the center of scaling a marketing engine that not only drives growth but also strengthens national security by empowering contractors to meet critical compliance standards. If you're looking for an opportunity to build, innovate, and make an immediate impact — while working alongside a passionate team of experts — C3 is the place to do it. ____________________________________________________________ This role is operations-first, focused on maintaining, monitoring, securing, and optimizing IT environments across multiple managed client environments while supporting CMMC Level 2 (NIST SP 800-171) technical requirements. While there will be selective opportunities to support infrastructure improvements and technology deployments, the primary focus of this role is operational stability, proactive maintenance, security monitoring, documentation, and senior-level technical support. This position is not primarily a solution architecture, project management, or compliance auditing role.

Requirements

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

Nice To Haves

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

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

Benefits

To be a part of one of the fastest-growing companies in America, and a talented team to back you up.
An awesome culture, backed up by winning several Best Places to Work awards.
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