Systems Administrator

Our client, a well-established investment management firm with approximately $20 billion in assets under management, is seeking a highly skilled and versatile Systems Administrator. This is a hands-on individual contributor role with high visibility across all trading technology groups. You will collaborate closely with the CTO and Engineering teams to maintain and evolve a diverse infrastructure environment spanning Windows, Linux, VMware, and cloud platforms.Core ResponsibilitiesInfrastructure Management: Maintain and build out infrastructure, including physical servers at the headquarters and offsite data center locations.Mixed Environment Support: Manage a workload roughly split between Windows Server/Microsoft 365 (70%) and enterprise Linux administration (30%).Cloud & Virtualization: Provision and configure AWS EC2 instances and manage VMware vSphere (ESXi) virtualized environments.Network & Security: Oversee TCP/IP, DNS, DHCP, and VLANs while managing enterprise-grade firewalls (e.g., Palo Alto, Fortinet).Physical Operations: Handle server hardware tasks including racking, cabling, diagnostics, and component replacement.Required Technical SkillsWindows: In-depth knowledge of Active Directory, Azure AD, MS Teams, and Multi-Factor Authentication.Linux: Hands-on experience building and configuring Linux environments from scratch (specifically Rocky Linux).Networking: Strong understanding of email flow, routing, spam filtering, and malware protection.Automation: Working knowledge of PowerShell, Python, or Bash for task automation and workflow optimization.Security: Familiarity with endpoint security, EDR tools, and IT compliance standards suitable for a regulated financial environment.QualificationsExperience: 5+ years of experience managing enterprise-level IT infrastructure.Industry Background: Professional experience in financial services, hedge funds, or similarly regulated environments is strongly preferred.Education: Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent professional experience).Bonus: Experience with configuration management tools such as Ansible.Benefits & CultureCareer Growth: This is a stable, long-term opportunity at a firm that values technical depth and clear communication.Location: Office located in Old Greenwich, CT; 5 days/week onsite.