System Administrator III

Onward Energy•DENVER, CO

7d•Hybrid

About The Position

Onward Energy is seeking an experienced, detail-oriented System Administrator III to join its IT Infrastructure team. The role designs, implements, and manages enterprise IT infrastructure, including internal, hosted, and cloud systems, supporting reliable and secure IT and OT operations across approximately 60 locations. The position works closely with IT colleagues and partner teams in a growing organization where technologies, equipment, and processes change frequently. The System Administrator III serves as a senior technical resource for complex system issues and infrastructure initiatives. The position supports server, virtualization, identity, Azure, Microsoft 365, device management, and OT infrastructure, while ensuring systems are secure, maintained, documented, and compliant with company requirements. It may provide on-call or after-hours support for critical issues and planned maintenance, and it provides technical guidance to other IT staff. The position reports to the Director – Technology Services and has no direct reports. It is a full-time, exempt role based in Denver, Colorado, with a hybrid work arrangement.

Requirements

At least 7 years of progressive experience in system administration or infrastructure engineering roles.
Strong expertise in Windows Server administration in enterprise environments.
Extensive hands-on experience with Active Directory, Group Policy, DNS, DHCP, and identity services.
Significant experience supporting Microsoft Azure IaaS components in production environments.
Strong knowledge of Microsoft 365 / Office 365, including Entra ID (Azure AD), Intune, and core collaboration services.
Solid experience with virtualization platforms, particularly Hyper-V.
Experience implementing and supporting SAML-based SSO and identity federation.
Strong understanding of backup, disaster recovery, high availability, and business continuity concepts.
Ability to work comfortably amid frequent change, evolving priorities, and emerging technologies.
Excellent troubleshooting skills and ability to work independently on complex technical challenges.
Strong written and verbal communication skills, including the ability to document and explain complex systems clearly.

Nice To Haves

Power generation industry experience.
Related certifications, such as Azure, Office 365, or Windows Server certifications.
Experience configuring enterprise network hardware.
Experience with or exposure to OT / ICS / SCADA systems and networks.
Experience integrating environments during M&A activities, including directory, tenant, and infrastructure consolidation.
Familiarity with cybersecurity frameworks, audits, and compliance requirements in regulated environments.
Experience supporting distributed infrastructure across geographically dispersed sites.
Scripting or automation experience, such as PowerShell or Azure CLI.

Responsibilities

Design, implement, administer, and support enterprise server, virtualization, identity, and cloud platforms across IT and OT environments.
Serve as a senior technical resource for complex systems issues, incidents, and escalations, performing troubleshooting and root cause analysis.
Administer and evolve Active Directory, Group Policy, DNS, DHCP, and identity-related services in a hybrid environment.
Design, administer, and support Microsoft Azure services, including virtual machines, storage, networking, identity integration, and security controls.
Manage and enhance Microsoft 365 / Office 365 services, including Entra, Exchange Online, SharePoint Online, Teams, and Intune.
Implement and maintain Intune device management and security solutions, including configuration, security, and application deployment policies for Windows and mobile devices.
Support and integrate SAML-based single sign-on and identity federation with third-party applications and services.
Administer enterprise virtualization platforms, primarily Hyper-V, and associated storage, backup, and recovery systems.
Partner with Network Administration and Cybersecurity teams on secure system configurations, segmentation, and compliance with security standards.
Participate in and often lead systems-related infrastructure projects, upgrades, migrations, and refresh initiatives.
Support systems integration or separation during mergers and acquisitions, including identity consolidation, domain strategy, tenant integration, and infrastructure alignment.
Ensure systems are hardened, patched, monitored, and compliant with company security, operational, and audit requirements.
Support OT infrastructure in collaboration with SCADA, engineering, and operations teams, focusing on reliability, safety, and compliance.
Develop, maintain, and improve technical documentation, standards, diagrams, runbooks, and disaster recovery procedures.
Provide on-call or after-hours support as needed for critical infrastructure issues and planned maintenance.
Mentor and provide technical guidance to system administrators and other IT staff.