Senior Systems Administrator

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.

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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.

What You'll Do:

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

What You'll Bring

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

Preferred

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)

What You'll Get

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

This a remote US-based position with minimal travel. 

C3's Core Values:

Team Human : Respecting all humans is a critical part of who we are at C3. We practice integrity in all interactions, we empathize with others, we create a supportive work environment, and we support the communities in which we live and operate.

Security First : At the cornerstone of our business, we prioritize security above convenience, cost or efficiency. A “security-first” approach means we practice what we preach and we lead by example for our clients.

Be an Advocate : We are passionate in our advocacy for our customer’s success and a path to the best solution for their business. We embrace feedback, put ourselves in your shoes and advocate for your interests as our own.

Embrace Change : It's a practical necessity in an industry that never stands still. As a new entity born from the merger of two top-ranked CMMC-focused IT services companies, we're keenly aware that our success hinges on our ability to adapt - whether that means integrating new platforms, refining processes, or keeping pace with changing guidelines.

Resilience : Our ability to withstand adversity and accomplish objectives while maintaining professionalism and discipline is critical to successful crisis management and risk avoidance.

C3 Integrated Solutions is an Equal Opportunity Employer encouraging diversity in the workplace. All qualified applicants will receive consideration for employment without regard to race, national origin, gender identity/expression, age, religion, disability, sexual orientation, genetics, veteran status, marital status, or any other characteristic protected by law.

This is a general description of the duties, responsibilities and qualifications required for this position. Physical, mental, sensory, or environmental demands may be referenced to communicate the way this position traditionally is performed. Whenever necessary to provide individuals with disabilities an equal employment opportunity, C3 Integrated Solutions will consider reasonable accommodations that might involve varying job requirements and/or changing the way this job is performed, provided that such accommodations do not pose an undue hardship.