Senior Systems Administrator

Responsibilities

• Administer, maintain, and optimize enterprise Windows Server environments, ensuring high availability, performance, and security.
• Manage Hyper-V virtualization infrastructure and support server lifecycle activities including deployments, upgrades, patching, and performance tuning.
• Administer Microsoft 365 services including Exchange Online, Teams, SharePoint, and related cloud technologies.
• Manage Azure infrastructure, subscriptions, identity services, and cloud resources.
• Maintain Active Directory, Group Policy, DNS, DHCP, and identity management services.
• Support enterprise storage infrastructure, including SAN environments and backup technologies.
• Configure, manage, and troubleshoot enterprise networking components including firewalls, switches, wireless networks, VPNs, and WAN connectivity.
• Manage Cisco Firepower and SonicWall firewalls, including security policies, VPN configuration, NAT, content filtering, and threat prevention.
• Manage Aruba switching infrastructure, VLANs, routing, network segmentation, and wireless environments utilizing Aruba and Ubiquiti technologies.
• Maintain infrastructure health, identify trends, and proactively resolve issues before they impact business operations.
• Lead troubleshooting efforts for complex infrastructure incidents and perform root cause analysis.
• Participate in infrastructure projects including migrations, upgrades, cloud initiatives, and technology implementations.
• Develop and maintain technical documentation, network diagrams, operational procedures, and configuration standards.
• Partner with security teams to implement infrastructure security best practices and remediation efforts.
• Identify opportunities to automate administrative tasks using PowerShell and other automation tools.
• Mentor junior team members and provide technical leadership on infrastructure initiatives.

Requirements

• 7+ years of enterprise systems administration experience.
• Extensive experience administering Windows Server environments.
• Strong knowledge of Active Directory, Group Policy, DNS, DHCP, and Microsoft identity services.
• Experience supporting Microsoft 365 and Microsoft Azure environments.
• Hands-on experience administering Hyper-V virtualization.
• Strong enterprise networking experience including firewalls, switching, VPNs, wireless networking, and network troubleshooting.
• Experience supporting Cisco Firepower and SonicWall firewall platforms.
• Experience managing Aruba switching infrastructure.
• Experience supporting Aruba and Ubiquiti wireless environments.
• Experience with enterprise storage platforms and backup solutions.
• PowerShell scripting and automation experience.
• Excellent troubleshooting, communication, and problem-solving skills.
• Able to manage multiple priorities in a fast-paced enterprise environment.

Qualifications

• Must be authorized to work in the United States without sponsorship.

Skills

• Microsoft infrastructure expertise.
• Networking experience.
• Proactive approach to system reliability, security, and continuous improvement.

Benefits

(Not specified)

Pay

(Not specified)

Schedule

(Not specified)