Senior Systems Administrator

Senior Systems Administrator – R3 LLC (McLean, VA)

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At R3, we are committed to providing our clients with best-in-class solutions for all of their IT needs. We are relentless in our pursuit of excellence and dedicated to providing our clients with unsurpassed quality, service, and value day in and day out. As we continue to grow and innovate, we are seeking passionate and dedicated individuals to join our team.

If you’re ready to join our mission of setting the standard for IT excellence, we are looking for a talented Senior Systems Administrator to join our team. As a Senior Systems Administrator you’ll manage and support Microsoft-based systems across on-premises and cloud environments, oversee incident resolution and root‑cause analysis, and lead project‑based initiatives that drive infrastructure improvement. You’ll play a key role in designing, deploying, and maintaining client cloud environments, leveraging your expertise in Azure, Microsoft 365, Intune, and Defender for Endpoint, while documenting best practices and creating runbooks to strengthen operational consistency.

• Provide ongoing support and mentorship to junior staff and peers.
• Manage incident and problem resolution, including root‑cause analysis.
• Handle hardware and software troubleshooting, end‑user support, and ticket handling.
• Manage and implement assigned project‑based solutions, communicating progress to stakeholders.
• Develop and maintain knowledge base articles and runbooks.
• Assist in planning, installation, and support of client cloud systems infrastructure.
• Support on‑premises hardware and software and cloud‑based devices and related software.
• Troubleshoot and resolve issues related to client infrastructure.
• Participate in on‑call, after‑hours, and weekend support as needed.

• 7+ years of experience administering Microsoft‑based solutions and products:
  Azure, Microsoft 365, Intune, Defender for Endpoint, Teams, Exchange Online, Windows Server, Active Directory, etc.
• U.S. Citizen (Federal client requirement).
• Bachelor’s degree in information technology/security, Computer (Information) Science, Management Information Systems, or related discipline. Or 10+ years of demonstrated experience in systems administration with a focus on Microsoft and Cloud Technologies.
• Preferred certifications: MCP, Microsoft Certified:
  Azure Solutions Architect Expert, Azure Administrator Associate, Azure Virtual Desktop Specialty.
• Familiarity with industry best practices and standards (ITIL, ISO 20000‑1, CMMI‑SVCs) a plus.
• Technical knowledge of tools like Connect Wise Automate, Hudu, Mimecast, Meraki, etc.

• Competitive wages to reflect your experience and skills.
• Hybrid Option for this role: 2 days in office.
• Comprehensive medical, dental, and vision insurance plans to keep you and your family healthy.
• 401(k) with company match to help you plan for the future.
• Flexible time off policies to ensure you maintain a healthy work‑life balance.
• We offer many remote opportunities, allowing you to work wherever you want.
• We are committed to creating a positive impact on society and encouraging our employees to do the same.
• We are reshaping the industry and the way it thinks about technology and service.
• We strive to be better and encourage our employees to do the same by offering training incentives and bonuses to help you and your career grow.
• The opportunity to be a part of an amazing team.

$90,000 – $110,000 per year. This range reflects base pay only and does not include bonuses, incentives, benefits, or other forms of compensation that may be offered as part of the total compensation package.

R3 is an equal opportunity employer. It has been and will continue to be a fundamental policy of R3 to not discriminate on the basis of race, color, religion, gender, gender identity, pregnancy, marital status, sexual orientation, age, national origin, alienage or citizenship status, veteran or military status, disability, medical condition, genetic information, or any other characteristic prohibited by federal, state, and/or local laws.

This policy applies to all aspects of employment, including hiring, promotion, demotion, compensation, training, working conditions, transfer, job assignment, benefits, and termination.

Mid‑Senior level

Full‑time

Information Technology