L3 Helpdesk Engineer / Systems Administrator

Description

We are looking for an experienced L3 Helpdesk Engineer / Systems Administrator to provide senior-level technical support and infrastructure leadership. This role is ideal for a hands-on, detail-oriented individual who can resolve high-impact issues, strengthen core systems, and help shape reliable support practices across Microsoft, cloud, and virtualization environments. You will work across escalated incidents, strategic improvements, and project delivery while guiding entry-level team members and maintaining strong technical standards.

Responsibilities:
Act as the highest technical escalation resource for challenging production incidents, driving issues through to resolution with urgency and precision.
Troubleshoot and resolve complex problems across cloud platforms, server infrastructure, identity services, endpoints, and business applications.
Conduct detailed root cause investigations and implement corrective actions that reduce recurring issues and improve service stability.
Architect, deploy, and support scalable IT solutions across Microsoft 365, Windows Server, Azure, and hybrid environments.
Oversee advanced technical initiatives for internal teams and clients, ensuring milestones, quality expectations, and operational readiness are met.
Transition newly introduced services and platforms into steady-state support by establishing support procedures, documentation, and ownership.
Provide day-to-day guidance to Level 1 and Level 2 engineers through mentoring, technical coaching, and escalation support.
Administer core Microsoft technologies including Exchange Online, Teams, SharePoint, OneDrive, VMware vSphere/vCenter, Azure Virtual Desktop, FSLogix, and multi-session Windows environments.
Manage identity, security, and endpoint platforms by supporting Microsoft Entra ID, Intune, Autopilot, and automation efforts through PowerShell scripting.

Requirements

5+ years of experience in systems administration, systems engineering, or advanced technical support roles.
Proven background providing senior-level or Level 3 escalation support for complex infrastructure environments.
Strong hands-on expertise with Microsoft 365 services, including Exchange Online, SharePoint, Teams, and OneDrive.
Advanced working knowledge of Microsoft Azure, hybrid cloud environments, and VMware vSphere virtualization.
Experience administering identity and access management solutions, including Microsoft Entra ID and related cloud identity tools.
Practical knowledge of endpoint administration using Microsoft Intune, Endpoint Manager, and Windows Autopilot.
Ability to create and maintain automation scripts using PowerShell.
Must be able to work onsite in New York, New York.

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