Job SummaryWe are seeking a highly skilled, Senior Windows Systems & Active Directory Administrator to lead the design, administration, security, and optimization of our enterprise Windows Server and Active Directory environment. This role will have significant responsibility for management and maintenance of Windows Server infrastructure, including Active Directory, Group Policy, DNS, DHCP, PKI, and VMware virtualization, as well as patch management, vulnerability remediation, and compliance-leveraging enterprise tools such as Qualys, Tanium, and BigFix. The ideal candidate will combine deep technical expertise with leadership ability, driving critical projects, ensuring system integrity, and aligning with organizational technology and security standards.
Must-Have Requirements Expert-level knowledge of Windows Server and Active Directory administration, including Domain Controllers, Group Policy, DNS, DHCP, and PKI.
Proven experience with enterprise patching and vulnerability remediation using tools such as Qualys, Tanium, and/or BigFix.
Strong understanding of Active Directory architecture, replication, and Group Policy management, with at least five (5) years of hands-on experience in large enterprise environments.
Advanced troubleshooting and performance optimization skills for Windows Server environments, including authentication services and directory components.
Experience leading infrastructure upgrades, migrations, and security remediation projects in compliance-driven organizations.
Scripting/automation proficiency using PowerShell for patch deployment, vulnerability remediation, and system configuration tasks.
Nice-to-Have (Good-to-Have) Skills Familiarity with identity and access management (IAM) solutions and integrations, including MFA, SSO, and federation (e.g., SAML, Entra ID, PingID).
Experience with security frameworks and compliance standards such as NIST, CIS Benchmarks, and zero-trust architecture.
Knowledge of disaster recovery and backup strategies for both Windows Server and Active Directory environments.
Strong documentation and mentoring skills to train junior administrators and maintain accurate system and process records.
Key Responsibilities Serve as a technical lead for critical migration or infrastructure projects.
Troubleshoot and optimize system performance, including hardware, system backups, updates, virtualization environments, and directory services.
Manage enterprise-level Active Directory environments, including cloud-related technologies such as Azure AD, Microsoft Entra ID, Microsoft 365, and identity federation tools like PingID.
Design and maintain GPOs, DNS/DHCP configurations, PKI services, and Active Directory replication.
Administer, secure, and maintain enterprise-level Windows Server and Active Directory infrastructure.
Manage patch deployment cycles, vulnerability scans, and remediation activities using Qualys and Tanium.
Monitor and resolve vulnerabilities in accordance with security and compliance requirements.
Lead complex infrastructure projects, including migrations, consolidation, and virtualization initiatives (VMware and cloud-based platforms).
Automate administrative tasks and patching processes via PowerShell and other scripting tools.
Collaborate closely with cybersecurity teams to align patching and vulnerability management with security policies.
Produce and maintain comprehensive documentation for processes, configurations, and architectural decisions.
The preceding description is not designed to be a complete list of all duties and responsibilities required of the position.
As a public utility, NiSource provides essential services to customers 24/7. Emergency needs can arise at various times throughout the year, including during storm season. Employees may be required to support emergency response efforts, which could include working outside normal hours or assisting with tasks outside of typical responsibilities.
Work AuthorizationCandidates must be legally authorized to work in the United States and must not require employer sponsorship now or in the future.
Workplace ConnectionWe value a workplace where everyone feels respected, included, and able to do their best work. We encourage open dialogue, value different perspectives, and work collaboratively with employees, customers, and partners.
We recognize and respect the unique experiences people bring, including different backgrounds, cultures, and viewpoints. We treat others with professionalism and care, and we each play a part in creating a positive work environment.
Veteran Hiring & InclusionNiSource is proud to support veterans, transitioning service members, and military spouses. We value the leadership, teamwork, and mission-focused experience the military community brings, and we are committed to providing an inclusive workplace with opportunities for professional growth and development.
Equal Employment Opportunity NiSource is committed to providing equal employment opportunities in each of its companies to all employees and applicants for employment without regard to race, color, religion, national origin or ancestry, veteran status, disability, gender, age, marital status, sexual orientation, gender identity, sex (including pregnancy, lactation, childbirth or related medical conditions), genetic information, citizenship status, or any protected group status as defined by law. Each employee is expected to abide by this principle.
By applying, you may also be considered for other roles that match your skills and experience. ADA AccommodationsIf you need a reasonable accommodation to participate in any stage of the hiring process or to perform the essential functions of the position, please contact OneHR at or 1-
Safety StatementSafety is a core value at NiSource. Employees are expected to follow safety requirements, report hazards, and help maintain a safe environment for themselves and their coworkers.
E-VerifyNiSource participates in the U.S. Department of Homeland Security's E-Verify program. Please review the following notices regarding your rights and responsibilities under U.S. law.
- E-Verify Poster (English and Spanish)
- Right to Work Poster (English and Spanish)
Salary Range*:$113,500.00 - $170,300.00
*The salary offered to a candidate is based on several factors including but not limited to the candidate's skills, job-related knowledge, and relevant experience, as well as internal pay equity. Posting Start Date:2026-08-28
Posting End Date (if applicable):Please note that the job posting will close on the day before the posting end date. 
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