Senior Systems Admin: On-Site Infra & Security Lead (NYC/CT)

Cleartech Recruiting; New York (NY); On-site; USD 120,000 - 180,000; Full time

Job summary

Cleartech Recruiting is seeking an on-site Senior IT Infrastructure Administrator for a leading global hedge fund in NYC or CT. You will manage Active Directory, Entra ID, Microsoft 365, VMware, networks, and data governance while mentoring junior staff.

Reqs: 7+ years of enterprise IT, strong scripting (PowerShell), VM/Storage, and security tool experience. On-site only, occasional after-hours work, NYC to CT travel possible.

Qualifications

• 7+ years of hands-on enterprise systems administration experience.
• Strong Windows Server, Active Directory, Microsoft 365, MFA, and PowerShell skills.
• Experience with Entra ID, service accounts, application registrations, and credential management.
• Strong VMware, storage, networking, firewall, and email-security experience.
• Experience with security tools such as CrowdStrike, Varonis, Proofpoint, or similar.
• Experience with backups, DR, monitoring, change control, and regulated/audited environments.
• Strong project, vendor-management, documentation, and communication skills.
• Bachelor's degree or equivalent experience.
• Financial services or regulated-industry experience.

Responsibilities

• Manage Active Directory, Entra ID, service accounts, MFA, access reviews, and security controls.
• Administer Microsoft 365, Exchange Online, Teams, SharePoint, OneDrive, email security, and DLP.
• Manage Windows Server, VMware vSphere, file servers, storage, backups, and migrations.
• Administer networks, DNS, DHCP, VLANs, wireless, certificates, firewalls, and telecom.
• Manage endpoint security, vulnerabilities, phishing simulations, and data-governance tools.
• Support eDiscovery, legal holds, audits, regulatory requests, and IT controls.
• Automate administration and reporting using PowerShell and Python.
• Manage software/cloud licensing, vendors, renewals, and procurement.
• Lead infrastructure and security projects from planning through implementation.
• Maintain change management, documentation, compliance, and operational procedures.
• Serve as technical escalation point and mentor junior IT staff.
• Coordinate server-room power, cooling, UPS, and datacenter infrastructure.

Skills

Active Directory

Windows Server

Microsoft 365

PowerShell

Entra ID

VMware vSphere

Networking basics

Education

Bachelor's degree or equivalent experience

Tools

VMware vSphere

CrowdStrike

Varonis

Proofpoint

Job description

Cleartech Recruiting is seeking an on-site Senior IT Infrastructure Administrator for a leading global hedge fund in NYC or CT. You will manage Active Directory, Entra ID, Microsoft 365, VMware, networks, and data governance while mentoring junior staff.

Reqs: 7+ years of enterprise IT, strong scripting (PowerShell), VM/Storage, and security tool experience. On-site only, occasional after-hours work, NYC to CT travel possible.