Senior Systems Administrator
The Senior Systems Administrator owns hands-on infrastructure administration, networking, security processes, device management, and user support across corporate, field, and industrial sites. The role requires 5+ years of systems and network administration experience, strong Microsoft 365 and Entra ID expertise, and the ability to build foundational processes.
About the job
Responsibilities
- Administer Microsoft 365, Entra ID, and centralized authentication/SSO across corporate and field sites.
- Own the technical layer of SharePoint, including permissions, architecture, and governance.
- Manage user access, device provisioning, and onboarding/offboarding with HR.
- Manage software and SaaS licensing, renewals, entitlements, and cost optimization.
- Establish hardware lifecycle management across offices, pilot facilities, and field sites, including procurement, provisioning, tracking, and retirement.
- Configure and support routers, switches, firewalls, VPNs, and wireless networks across a multi-site environment.
- Drive network monitoring, segmentation, and IT/OT boundary improvements.
- Build and document backup and disaster recovery plans, security controls, vulnerability management, incident response, and change management processes.
- Coordinate and hold managed service providers and consultants accountable.
- Serve as the primary escalation point for complex user and site support issues.
- Develop help desk processes, documentation, and SLAs.
- Mentor junior IT staff and build documentation and training.
- Travel approximately 25% to other offices and project sites.
Requirements
- 5+ years of systems and network administration experience with end-to-end ownership of infrastructure projects.
- Deep hands-on experience with Microsoft 365 and Entra ID, including centralized authentication and SSO configuration.
- Strong networking fundamentals, including VLANs, segmentation, firewalls, VPNs, wireless, routing, and switching.
- Direct experience with enterprise networking hardware.
- Working proficiency in PowerShell or similar scripting for administration and automation.
- Experience managing organization-level software and service licensing, renewals, and vendor coordination.
- Demonstrated ability to build processes, systems, or tools from scratch and operate with incomplete documentation and ambiguity.
- Experience coordinating or overseeing managed service providers or outside consultants.
Nice-to-Haves
- Experience in industrial, mining, or OT-adjacent environments.
- Familiarity with NIST SP 800-171, CMMC, or ISO 27001.
- Experience with Apple/Mac devices.
- Experience with Ubiquiti networking.
Skills
Microsoft 365, Entra Id, Single Sign-On, Sharepoint, PowerShell, Vlans, Firewalls, Vpns, Wireless Networking, Routing, Switching, Backup And Disaster Recovery, Vulnerability Management, Ubiquiti
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