Systems Administrator

Cleartech Recruiting; Greenwich (CT); On-site; USD 110,000 - 150,000; Full time

Job summary

Cleartech Recruiting is representing an investment management client seeking a skilled Systems Administrator to oversee Windows, Linux, VMware, and cloud infrastructure. The role is hands-on and high-visibility across trading technology, reporting to the CTO and Engineering teams.

Primary duties include infrastructure provisioning, security, and performance optimization. The ideal candidate will combine 5+ years of enterprise IT experience with financial services exposure, strong AD/Azure AD

Qualifications

• 5+ years of experience managing enterprise IT infrastructure.
• Experience in financial services or regulated environments preferred.
• Bachelor's degree or equivalent experience.
• Experience with Windows Active Directory/Azure AD and Microsoft 365.
• Bonus: Ansible configuration management experience.

Responsibilities

• Maintain and build out infrastructure including HQ servers and offsite data centers.
• Support mixed Windows Server/Microsoft 365 and Linux environments.
• Provision and configure AWS EC2 and manage VMware vSphere environments.
• Oversee network services (DNS, DHCP, VLANs) and enterprise firewalls.
• Handle physical server tasks such as rack, cabling, diagnostics and part replacement.

Skills

Windows Admin

Linux Admin (Rocky)

Networking

Automation scripting

Security & compliance

Education

Bachelor's degree in Computer Science or related field

Tools

Ansible

Job description

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 Responsibilities

• Infrastructure 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 Skills

• Windows: 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.

Qualifications

• Experience: 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 & Culture

• Career 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.