Senior Systems Administrator

About Us VT-ARC, a technical services and applied research company, has built an organizational culture marked by four primary values: Teamwork, Integrity, Excellence, and Service. Integral to our success is our staff's enthusiasm for solving tough problems by working together in teams to get the job done. We foster a culture where every employee's contribution is valued and performed with integrity while maintaining a fun work environment. VT-ARC strives for excellence in all that is done for our clients, and such achievement is recognized through service/merit awards. Moreover, we promote a sense of community larger than VT-ARC alone, where staff and institutional resources can be applied in service to our country. We are proud to be the recipient of the Best Workplace in Defense Award by Emergent Magazine, an honor that recognizes companies with positive cultures that not only impact their people but also make a meaningful difference in the community. About You 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 ID, Windows Server, virtualization, networking, endpoint management, and cybersecurity technologies. You are comfortable leading infrastructure modernization, cloud, and security initiatives while remaining hands‑on with deployment, troubleshooting, automation, documentation, and operational support. You excel at translating business requirements into secure, scalable, and supportable technology solutions that improve reliability, compliance, and user experience. Duties/Responsibilities 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 ID, 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 assisting with implementation, monitoring, documentation, and maintenance of 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. Desired Education, Certification, Skills, Capabilities 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 place 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 GovCloud. Experience managing and configuring Cisco firewalls, routers, and switches. Familiarity with cybersecurity and compliance framework. #J-18808-Ljbffr