> Markdown version of [/jobs/ext/2965109-senior-systems-administrator-it-job-in-ithaca](https://www.wearedevelopers.com/jobs/ext/2965109-senior-systems-administrator-it-job-in-ithaca). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior Systems Administrator - IT job in Ithaca

- **Company:** RACKER INC.
- **Location:** Ithaca, NY, United States (Remote available)
- **Experience:** Expert
- **Salary:** $75,000.0 - $85,000.0
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Active Directory, Active Directory Federation Services, Domain Controllers, Audit Trail, Microsoft Azure, Dynamic Host Configuration Protocol, Disaster Recovery, Domain Name System (DNS), Hyper-V, Identity and Access Management, Virtual Private Networks (VPN), Windows Servers, Network Architecture, Network Administration, Public Key Infrastructure, Windows PowerShell, Role-Based Access Control, Azure Active Directory, Security Information and Event Management, Computer Network Technologies, HybridCloud, Firewalls (Computer Science), Git, Patch Management, Fortinet, CIS Benchmarks, Software Version Control
- **Published:** September 17, 2026
- **Apply:** https://jobs.diversity.com/career/2493217/senior-systems-administrator-it-new-york-ny-ithaca

## About the Role

* 4+ years of Windows Systems Administration in a production environment.
 * Deep, hands-on Active Directory expertise: GPO, DNS, DHCP, replication, FSMO, and AD security.
 * Strong PowerShell scripting/automation skills.
 * Solid Microsoft 365 / Entra ID administration experience (Exchange Online, Conditional Access, MFA).
 * Working knowledge of Windows Server, Hyper-V, and core networking (DNS, DHCP, VPN, firewalls).
 * Security fundamentals: hardening, least privilege, certificate/PKI basics, and patch management.
 * Comfort with version control (Git) and documentation discipline.

## Description

We are seeking an experienced Systems Administrator to own the day-to-day operation, security, and reliability of our Windows-based, hybrid-cloud IT environment. This is a hands-on senior role responsible for Active Directory and identity, Microsoft 365 / Entra ID, server and endpoint management, security hardening, monitoring, co-managed network infrastructure, and backup/disaster recovery across a multi-site organization (~30 locations)., Identity & Access Management

 * Administer on-prem Active Directory: domain controllers, replication health, FSMO roles, Sites & Services, DNS, and Group Policy (design, testing, and staged fleet rollout).
 * Manage hybrid identity: Entra Connect sync, ADFS, hybrid Azure AD join, and troubleshooting (e.g., PRT acquisition, device state).
 * Administer Microsoft 365 / Entra ID: user lifecycle, licensing, Conditional Access, MFA enforcement, and Privileged Identity Management (PIM).
 * Maintain service-account hygiene, privileged-group reviews, and least-privilege access.

Security & Compliance

 * Drive security hardening initiatives.
 * Remediate penetration-test findings and apply security baselines.
 * Manage Windows Firewall policy centrally via GPO maintain internal PKI/certificate lifecycle.
 * Maintain audit trails and operator attribution for sensitive actions.

Infrastructure & Operations

 * Manage the Hyper-V virtualization fleet, server lifecycle, and storage.
 * Administer multi-site network infrastructure: Fortigate VPN tunnels, UniFi wireless/switching, DHCP/DNS.
 * Plan and deploy Windows Updates fleet-wide monitor and orchestration.
 * Own backup and disaster recovery: validate jobs, manage retention, and test restores.

Monitoring, Automation & Tooling

 * Operate and tune the Graylog SIEM and event-log pipeline triage alerts across security platforms.
 * Develop and maintain PowerShell automation.
 * Maintain and extend internal operations tooling (custom dashboard, scheduled/automated reporting).
 * Use Azure DevOps for source control, CI/CD pipelines, work tracking, and documentation.

Documentation & Change Management

 * Maintain operational runbooks, change logs, and a knowledge-base wiki.
 * Follow a methodical, change-managed approach for high-risk changes (audit stage validate).

Support

 * Provide escalation support for endpoint, identity, email, and access issues partner with help-desk operations on SLA-tracked tickets.