Our client, an investment management firm, is seeking an experienced IT Manager / Senior Systems Administrator to oversee enterprise infrastructure, security operations, and IT governance. This hands-on role combines systems administration, technical project leadership, and operational oversight across a complex, regulated environment. The ideal candidate brings deep Microsoft infrastructure expertise, strong security and compliance knowledge, and the ability to lead technical initiatives while supporting day-to-day operations.

Key Responsibilities

• Administer and maintain enterprise infrastructure, including Windows Server, Active Directory, VMware vSphere, Microsoft 365, Exchange Online, and Windows/Samba file servers.

• Oversee identity and access management, including Entra ID, service accounts, credential rotation, access reviews, and least-privilege controls.

• Manage network infrastructure, firewalls, endpoint protection, email security, and data-governance platforms, ensuring system reliability and security.

• Lead infrastructure and security projects, including migrations, upgrades, disaster recovery planning, and vendor-led implementations.

• Maintain IT governance and compliance controls, including change management, access audits, vulnerability remediation, policy adherence, and regulatory documentation.

• Automate infrastructure administration, provisioning, and reporting using PowerShell and Python.

• Oversee software licensing, cloud subscriptions, vendor relationships, and technology procurement to optimize costs and operational efficiency.

• Serve as a senior technical escalation point, mentor junior IT staff, and coordinate support priorities, while managing physical server infrastructure, critical-environment systems, and telecommunications services.

Qualifications

• 7+ years of hands-on enterprise IT infrastructure experience in a Systems Administrator or similar role.

• Advanced knowledge of Windows Server, Active Directory, Microsoft 365, Exchange Online, VMware vSphere, and enterprise file storage.

• Experience managing service accounts, Entra ID application registrations, authentication controls, and credential lifecycles.

• Strong networking and security expertise, including TCP/IP, DNS, DHCP, VLANs, firewalls, endpoint protection, and secure email gateways such as Proofpoint or Mimecast.

• Proficiency in PowerShell automation, infrastructure monitoring, backup and recovery, and physical server hardware administration.

• Experience supporting IT governance and controls in regulated or audited environments, including access reviews, change management, and compliance documentation.

• Demonstrated ability to lead technical projects, manage vendors and licensing, troubleshoot complex issues, and communicate effectively with technical and non-technical stakeholders.

• Strong organizational skills, attention to detail, discretion, and the ability to mentor junior team members.

Preferred Qualifications: Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent experience). Financial services experience, AWS or Azure exposure, eDiscovery, configuration management tools, Bloomberg administration, and Avaya PBX familiarity are advantageous.

Compensation & Schedule

This is a full-time, fully onsite position based in New York City or Connecticut, requiring five days per week in the office. Occasional after-hours work is required for maintenance and recovery testing. Candidates based in NYC must be able to travel to Connecticut or Westchester as needed. The role also requires hands-on work with IT equipment and server room infrastructure.