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Systems Administrator (Linux & Windows)
Location: Greenwich, CT
Employment Type: Full‑time, Direct Hire
Work Model: 5 days/week onsite
Additional Travel: 2–3 times per month to the White Plains, NY datacenter About the Role
We’re seeking a highly skilled Systems Administrator to support and evolve a diverse, mission‑critical IT infrastructure spanning on‑premise and offsite datacenters. In this role, you’ll manage servers, networking, VMware environments, and physical hardware while collaborating closely with the CTO, Engineering, Data, and Systems teams. You’ll help define technical requirements, build reliable internal systems, strengthen cybersecurity posture, and ensure smooth day‑to‑day operations.
This position also includes triaging, prioritizing, and routing support tickets to maintain efficient issue resolution. We’re looking for someone who brings strong technical depth, proactive thinking, and a vision for infrastructure modernization. Responsibilities
Administer and maintain Linux and Windows server environments
Manage VMware vSphere infrastructure
Support Active Directory, Microsoft 365, Teams, and MFA solutions
Oversee networking components including TCP/IP, DNS, DHCP, VLANs, and firewalls
Monitor and secure email flow, including spam/malware filtering and DLP
Automate tasks using PowerShell, Python, or Bash
Perform hands‑on datacenter work: racking, cabling, diagnostics, and hardware replacement
Collaborate with cross‑functional teams to define system requirements and implement improvements
Prioritize and route support tickets to ensure timely resolution
Contribute to IT and cybersecurity policy development Required Qualifications
Expertise with Windows Server, Active Directory, Microsoft 365, Teams, and MFA
Strong enterprise Linux administration experience
VMware vSphere proficiency
Solid understanding of email security, filtering, and DLP
Strong networking knowledge (TCP/IP, DNS, DHCP, VLANs) and firewall management
Scripting experience (PowerShell, Python, Bash)
Hands‑on experience with physical server hardware and datacenter operations
Excellent troubleshooting and communication skills
Proficiency in server installation, configuration, and maintenance Preferred Qualifications
Degree in Information Technology or related field (or equivalent experience)
5+ years managing enterprise‑level infrastructure
Experience with AWS or Azure
Experience with Ansible or similar configuration‑management tools
