IT Senior System Administrator

ZOLLER Inc. is headquartered in Ann Arbor, Michigan and is widely known as the international leader in tool measuring and presetting machines, inspection machines, and tool management software. Our company has offices all over the world and is expanding continuously. We are looking for self-motivated, experienced professionals to join our team. Currently ZOLLER Inc. is seeking an IT Senior System Administrator for our office in Ann Arbor, Michigan.

IT Senior System Administrator - Ann Arbor, Michigan Introduction:
The Senior Systems Administrator is responsible for the day-to-day operational health, reliability, and security of ZOLLER’s IT infrastructure. This role balances hands-on ticket resolution with structured project delivery, supporting a modern Microsoft-centric environment across cloud, identity, endpoint, and networking domains. The role works in close collaboration with the Information Security team to implement infrastructure security remediations and ensure alignment with ISO 27001 controls and applicable EU regulatory requirements including CRA, NIS2 and GDPR.

Responsibilities:
Operational Support (∼50%)
• Serve as an escalation point for Tier 2/3 incidents across Windows, Linux, Network (Forti products), Microsoft 365, and Azure environments.
• Manage and resolve tickets within defined SLA targets, ensuring thorough documentation and root-cause analysis for recurring issues.
• Administer user accounts, groups, roles, and access rights via a hybrid Microsoft Entra  (Azure AD), enforcing least-privilege principles.
• Maintain endpoint health and compliance through Microsoft Intune, including device configuration profiles, compliance policies, and application deployment.
• Monitor infrastructure alerts and respond proactively to availability, performance, and capacity issues.
• Support the IT helpdesk team on complex escalations and provide mentorship on technical resolution approaches. Project Delivery (∼50%)
• Lead and contribute to infrastructure projects including cloud migrations, network upgrades, identity modernization, data classification, security upgrades, and endpoint management improvements.
• Design, implement, and document solutions within Microsoft Azure including virtual machines, AVD, storage, networking, and Azure-based services.
• Participate in infrastructure architecture reviews, contributing to scalable and secure design decisions.
• Develop and maintain runbooks, standard operating procedures, and infrastructure documentation in alignment with ISO 27001 documentation requirements.
• Coordinate with vendors and managed service partners on project delivery and escalations. Security Collaboration
• Partner with the Information Security team to implement and validate infrastructure security remediations identified through risk assessments, audits, or vulnerability management processes.
• Support the application of Conditional Access policies, MFA enforcement, and identity protection controls within Microsoft Entra .
• Assist with patch management processes, ensuring timely remediation of vulnerabilities across servers, network devices, and endpoints.
• Contribute to audit evidence collection and control testing activities in support of ISO 27001 certification and CRA/NIS2 compliance obligations.
• Adhere to and enforce the organization’s Acceptable Use Policy and information security policies. General
• Perform other duties as reasonably required by the team lead, commensurate with the seniority of the role.
• Maintain professional development in line with emerging technologies and evolving security requirements. Requirements:
Technical Skills
• Must be legally authorized to work in USA – Sponsorship is not available for this role
• Minimum 5 years of experience in a systems administration or infrastructure engineer role.
• Strong hands-on expertise with Microsoft Windows Server (2016/2019/2022): AD DS, DNS, DHCP, Group Policy, DFS.
• Proficiency in Microsoft 365 administration:
Exchange Online, SharePoint Online, Teams, and One Drive.
• Demonstrated experience with Microsoft Entra  (Azure Active Directory): user/group management, Conditional Access, MFA,…