Senior Systems Administrator

About Us VT-ARC is a technical services and applied research company that values teamwork, integrity, excellence, and service. We solve tough problems by working together, valuing each employee’s contribution, and maintaining a fun work environment. Our commitment to excellence is recognized through service/merit awards and a Best Workplace in Defense Award by Emergent Magazine. VT-ARC promotes a sense of community larger than the organization, leveraging staff and institutional resources in service to our country.

You are a Senior‑Level Systems Administrator with experience designing, implementing, securing, and supporting enterprise IT infrastructure in commercial, government, and regulated environments. You possess expertise across Microsoft 365, Active Directory, Azure/Entra , Windows Server, virtualization, networking, endpoint management, and cybersecurity technologies. You are comfortable leading modernization, cloud, and security initiatives while remaining hands‑on with deployment, troubleshooting, automation, documentation, and operational support.

• Administer, maintain, and secure Windows and Linux Server environments across physical, virtual, and cloud infrastructure.
• Administer and manage enterprise security, networking, monitoring, systems, and network management platforms.
• Administer Active Directory, Entra , Exchange, SharePoint, Intune, and Teams.
• Configure and maintain Group Policy, DNS, DHCP, file services, identity management systems, and enterprise authentication services.
• Perform system monitoring, patch management, backup validation, performance tuning, and capacity planning.
• Deploy operating systems, applications, security baselines, and patches across enterprise devices.
• Support hardware lifecycle processes, including provisioning, onboarding, offboarding, and hardware refreshes.
• Support organizational cybersecurity and compliance initiatives by implementing, monitoring, documenting, and maintaining security controls aligned with regulatory and contractual requirements.
• Support vulnerability management, endpoint protection, SIEM monitoring, phishing mitigation, and incident response activities.
• Maintain secure system configurations and implement cybersecurity best practices.
• Support identity security initiatives, including SSO, privileged access management, and least privilege enforcement.
• Develop automation solutions using scripting and workflow automation tools.
• Integrate enterprise platforms to improve operational processes and business enablement.
• Develop and maintain technical documentation, SOPs, diagrams, and knowledge base articles.
• Provide tier‑3 escalation support and mentor junior IT staff.
• Assist with infrastructure modernization, cloud migration, and security improvement initiatives.
• Participate in disaster recovery, contingency planning, and after‑hours maintenance activities as needed.
• Perform software installations, patches, and upgrades to operating systems and enterprise applications.
• Ensure security and compliance of the IT infrastructure.
• Provide user education and training.
• Participate in technical research and development to enable continuing innovation within the enterprise infrastructure.
• Monitor and troubleshoot system performance and issues.
• Other duties as assigned.

• Bachelor’s degree in Information Technology, Cybersecurity, Computer Science, or related field and eight (8) years of relevant experience; or twelve (12) years of relevant professional experience in lieu of a degree.
• Expert knowledge and experience managing, configuring, and supporting Microsoft cloud technologies:
  Azure (IaaS), Azure AD, and Microsoft 365.
• Experience with secure cloud environments, including Microsoft GCC High and AWS Gov Cloud.
• Experience managing and configuring Cisco firewalls, routers, and switches.
• Familiarity with cybersecurity and compliance frameworks, including NIST 800‑171, CMMC, ISO 27001.
• Relevant technical certifications preferred, including Security+, Microsoft, Networking, Cloud, or cybersecurity‑focused credentials.
• Active U.S. security clearance preferred with the ability to obtain and…