Senior System Administrator

Job Overview

Responsible for the administration, security, and reliability of the company’s IT infrastructure including servers, networks, and Azure. This role ensures optimal performance, reliability, and security across hybrid on-premises and cloud environments.

Essential Duties and Responsibilities (Other duties may be assigned)

• Serve as the primary administrator for the company’s Azure infrastructure (virtual machines, networking, storage, identity, and monitoring).
• Manage and maintain LAN/WAN, VPNs, firewalls, WAPs, VLANs, and all network devices (primarily Cisco Meraki).
• Monitor and maintain infrastructure health, performance, and capacity, performing proactive maintenance and responding to incidents.
• Partner with the cybersecurity MSP to lead internal response for security alerts, vulnerabilities, and incidents.
• Support compliance efforts related to security frameworks (NIST, ISO 27001, SOC 2, SOX, or similar).
• Lead Windows Server and endpoint patching, including testing, deployment, and post-rollout validation.
• Support M365 tenant configurations, licensing, and integrations.
• Support mobile device management (MDM) via Intune for both corporate and BYOD assets.
• Manage server and workstation policies using a combination of Intune and Group Policy.
• Lead or participate in IT projects such as infrastructure upgrades, office expansions, or system migrations.
• Maintain comprehensive documentation (system configurations, network diagrams, SOPs, troubleshooting).
• Mentor junior IT staff to ensure coverage during absences.
• Perform scheduled after-hours maintenance following change control procedures.
• Occasionally assist with desktop troubleshooting and end-user support when team members are out of office or when there are spikes in support tickets

Qualifications

An employee in this position should have the following work experience, skill set, education/certifications, and physical/mental requirements:

Work Experience:

• 8 years of progressive IT infrastructure experience.
• Proven experience managing hybrid environments (on-premises Azure).
• Hands-on experience with Azure, Windows Server, Active Directory, and Cisco or Meraki networking.
• Experience managing M365 environments, with an emphasis on Entra and Intune.
• Experience with PowerShell automation for system and network administration.
• Exposure to Oracle Cloud Infrastructure is a plus.

Knowledge/Skills:

• Deep understanding of:
• Azure services: AD, VPN Gateway, VNets, storage, firewalls, ExpressRoute, monitoring tools.
• Networking: VLANs, subnets, DHCP/DNS, site-to-site VPNs, and IDS/IPS configuration.
• Security best practices: identity management, least privilege, MFA enforcement, logging, endpoint management.
• Windows infrastructure: Group Policy, patch management, and Intune.
• Strong troubleshooting and root-cause analysis skills across OSI layers.
• Excellent documentation, organization, and communication abilities. Ability to cross-train is key.
• Powershell and other similar scripting languages.

Education/Certification:

• Associate or bachelor’s degree in the field of computer science and/or Information Systems Management is preferred but not required.
• One or more of the following certifications strongly preferred:
• Microsoft Certified: Azure Administrator Associate (AZ-104)
• Cisco CCNA or CCNP
• CompTIA Security or Network