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# Senior System Administrator

- **Company:** Lumen Solutions Inc.
- **Location:** New York, NY, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Active Directory, Automation of Tests, Microsoft Azure, Domain Name System (DNS), Microsoft Exchange Server, Unix Shell, Microsoft SQL Server, System Center Configuration Manager, Windows Servers, Public Key Infrastructure, Windows PowerShell, Azure Active Directory, Scripting, HybridCloud, Hardware Infrastructure, Cloud Migration, Azure Resource Manager
- **Published:** July 21, 2026
- **Apply:** https://www2.jobdiva.com/portal/?a=yyjdnwtj1vk20likwp2a7oa2mc2scw064c948z22g23e046qehohegye8oqt3zi6&compid=0/jobs/28915311#/jobs/28915311

## About the Role

* Microsoft Azure - 10+ years (Microsoft Certification preferred).
 * Microsoft Exchange - Hybrid & Multi-Org enterprise environments.
 * Microsoft Active Directory - Multi-Forest Hybrid administration.
 * PowerShell / Unix Shell Scripting.
 * Windows Server & Unix/Linux Administration.
 * Microsoft Entra Connect, SCCM, ExpressRoute.
 * DNS, PKI, Group Policy, SQL Server.
 * Enterprise Infrastructure Design, Solution Architecture & Cloud Migrations.

## Description

We are looking for a Senior System Administrator with proven experience designing, implementing, and supporting enterprise-scale hybrid cloud and on-premises environments. The ideal candidate will have deep expertise in Microsoft Azure, Exchange, Active Directory, and automation scripting, along with experience supporting complex multi-forest, hybrid infrastructures in production environments., * Design, implement, and maintain hybrid Azure/on-premises infrastructure.

 * Administer and support enterprise Exchange and Active Directory environments.
 * Lead cloud migration and infrastructure modernization initiatives.
 * Troubleshoot complex enterprise client-server environments.
 * Develop automation scripts and optimize Azure resources.
 * Support enterprise infrastructure projects and mentor junior technical staff.


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