Senior Systems Administrator

Job Title: Senior Systems Administrator

Location : 4-5 Days On-Site, NYC


*Must be located/authorized to work in the US without visa sponsorship or transfer now or in the future. No C2C inquiries, please*



The Role
This team is looking for a senior Systems Administrator with deep expertise in Windows environments and Microsoft cloud technologies to take ownership of day-to-day IT operations. This person will be a hands-on technical lead, responsible for maintaining stability, driving improvements, and supporting a high-performance corporate environment.


You'll serve as the key link between the Head of IT and on-the-ground execution, bringing both strong technical depth and the ability to introduce structure, documentation, and scalable processes as the organization grows.

What You'll Do - IT Operations & Infrastructure

• Oversee daily administration of Windows-based systems, including Active Directory, Entra ID, DNS, DHCP, Group Policy, DFS, WSUS, Hyper-V, and Terminal Services
• Manage Microsoft cloud environments across M365 and Azure (Entra ID, Storage, Enterprise Apps, Networking, VMs)
• Support Windows 10/11 endpoints and core productivity tools
• Administer endpoint management and device security platforms
• Troubleshoot complex issues across hybrid (on-prem + cloud) environments
• Support multi-site, multi-domain, hybrid Active Directory setups

What You'll Do - Process, Support & Enablement

• Define and implement best practices for troubleshooting, ticketing, and escalation
• Train and mentor junior team members to elevate overall team capability
• Build and maintain clear documentation, SOPs, and operational runbooks
• Deliver high-quality end-user support across phone, email, chat, and remote channels
• Ensure a polished, high-touch experience for all users, including executives
• Partner with the Head of IT on specialized support needs (e.g., principal/residential tech)

What You'll Do - Systems, Network & Security

• Diagnose root causes and proactively prevent recurring issues
• Support enterprise WiFi systems (e.g., Aruba)
• Apply networking and security best practices in daily operations
• Participate in on-call escalation as needed
• Contribute to backup, disaster recovery, and business continuity planning
• Support compliance initiatives (e.g., SOC 2, financial services standards)

What They're Looking For

• Strong experience with Windows Server ecosystem (Active Directory, DNS, DHCP, Group Policy, DFS, WSUS, Hyper-V, Terminal Services)
• Expertise in Microsoft cloud platforms (M365, Azure, Entra ID, Storage, Networking, VMs)
• Proficiency with Windows 10/11 and Microsoft Office suite
• Experience administering Linux systems (Debian, Fedora)
• Skilled in troubleshooting complex infrastructure issues
• Experience managing hybrid AD environments across multiple domains/sites
• Familiarity with Google Workspace
• Experience with endpoint management tools and device security
• Exposure to AWS and/or Google Cloud Platform
• Scripting experience (e.g., PowerShell)
• Knowledge of enterprise WiFi systems (e.g., Aruba)
• Solid understanding of networking and security fundamentals
• Bachelor's degree in Computer Science, Information Systems, or a related field-or equivalent hands-on experience and certifications.

Who You Are

• Takes full ownership and accountability for systems and outcomes
• Stays composed under pressure and exercises strong judgment
• Brings a service-first mindset, especially when supporting executives and end users
• Communicates clearly, translating technical concepts into business terms
• Naturally organized, with a focus on process, documentation, and continuous improvement
• Proactive in identifying risks and solving root causes-not just symptoms
• Thrives in fast-paced, high-expectation environments
• Handles sensitive information with discretion and professionalism
• Experienced in demanding environments such as financial services or similar
• Collaborative team player who contributes to overall team success

$160-210K. Flexibility with experience.
#LI-EO1


Specialization :

• System Administration