Senior Systems Administrator

• 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.

• 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.

Preferred

• Bachelor’s degree or equivalent experience.
• Financial services or regulated-industry experience.
• AWS/Azure, Ansible, eDiscovery, Bloomberg, or Avaya experience.

Working Conditions

• Fully on-site; no remote/hybrid option.
• Occasional after-hours maintenance and recovery work.
• NYC employees may travel to CT/Westchester DR facilities.