Senior Sys Admin

Senior Sys Admin

Job Description

Location: Onsite, 5 days per week

Experience: Approximately 5+ years

Environment: Large enterprise environment

Position Overview

We are seeking an experienced Systems Administrator to support and maintain a large enterprise infrastructure environment. This role requires strong hands-on experience with Active Directory, Azure/Entra ID, domain controllers, DNS, and SSO configuration. The ideal candidate has approximately 5+ years of systems administration experience and has worked in a complex enterprise environment.

Key Responsibilities

• Administer and maintain Active Directory, including users, groups, Group Policy, authentication, permissions, and overall domain health.

• Perform domain controller upgrades, migrations, patching, and troubleshooting.

• Manage and troubleshoot DNS within an enterprise Windows environment.

• Support Microsoft Entra ID (Azure AD), including identity administration, synchronization, authentication, and access management.

• Configure and troubleshoot Single Sign-On (SSO) integrations with enterprise applications.

• Support hybrid identity environments integrating on-premises Active Directory with Microsoft Entra ID.

• Administer and troubleshoot Azure or AWS infrastructure and services.

• Monitor infrastructure performance, availability, security, and system health.

• Resolve escalated infrastructure issues beyond basic desktop or user support.

• Maintain technical documentation and follow enterprise change management and security processes.

• Required Qualifications

• Approximately 5+ years of Systems Administration experience.

• Strong, hands-on Active Directory experience beyond basic account provisioning and support.

• Demonstrated experience upgrading and maintaining domain controllers.

• Strong knowledge of DNS, Group Policy, authentication, and Windows Server environments.

• Hands-on experience with Microsoft Entra ID / Azure AD.

• Experience configuring and troubleshooting SSO.

• Strong experience with Microsoft Azure or AWS. Candidates with either cloud platform are acceptable.

• Current or previous experience supporting a large enterprise environment.

• Ability and willingness to work onsite 5 days per week.

• Preferred Qualifications

• Experience supporting hybrid on-premises/cloud identity environments.

• Experience with Entra Connect / Azure AD Connect, MFA, Conditional Access, and identity lifecycle management.

• PowerShell scripting or automation experience.

• Familiarity with enterprise monitoring, patching, backup, and change-management processes.