IT MANAGER/SENIOR SYSTEMS ADMINISTRATOR

Role: IT MANAGER/SENIOR SYSTEMS ADMINISTRATOR Location: New York City, NY or Old Greenwich, CT (5 Days a Week Onsite) Duration: Fulltime Core responsibilities · Identity and access governance: Lead the administration of Active Directory architecture, group design, and the service-account estate: service principal names, Entra ID application registrations, Graph API access, and credential rotation through our password vault. Maintain existing access standards, run periodic access and service-account reviews, and evaluate and process access exceptions in accordance with established approval procedures. · File and storage services: administer the Windows and Samba file-server estate across headquarters, the offsite datacenter, and remote offices; manage capacity, quotas, and monitoring; plan and execute server and share migrations; oversee archiving, backup, and data-governance tooling. · Email and collaboration platforms: administer Microsoft 365 and Exchange Online, including mail routing, mail security and filtering, DLP, retention and journaling, and the Teams, SharePoint, and OneDrive estate. · Server and virtualization infrastructure: build, patch, and maintain the Windows Server estate on VMware vSphere; hands-on work with physical server hardware including racking, cabling, diagnostics, and component replacement. · Network and perimeter: Administer and troubleshoot TCP/IP, DNS, DHCP, VLANs, wireless networks, certificates, and infrastructure-monitoring platforms. Configure, monitor, and manage firewalls to enforce access controls and protect the corporate network against unauthorized access and cyber threats. Manage telecom and ISP vendor relationships. · Security operations: administer endpoint protection, data-governance, and email-security platforms; manage multi-factor authentication, conditional access, and geographic access restrictions; run the security-awareness and phishing-simulation program; respond to alerts and vulnerabilities. · eDiscovery and legal hold: perform mailbox and file searches in support of subpoenas, regulatory requests, and litigation; preserve, collect, and produce data under the direction of counsel and Compliance, handling all of it with strict confidentiality. · Telephony and voice services: support the current Avaya PBX, associated analog lines, and voice-service vendors; troubleshoot and coordinate resolution of telephony incidents, provisioning, and office moves. Assist with the planned transition of PBX operations to an outsourced provider and oversee the vendor relationship thereafter. · Automation: use PowerShell and Python to automate provisioning, reporting, and task scheduling, and maintain our enterprise job scheduling platform. · License, subscription, and vendor governance: Oversee software and cloud-service entitlements, licensing, renewals, procurement, and vendor relationships. Review user licensing and assignments across platforms such as Adobe, Box, Microsoft 365/Intune, Visual Studio,…