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About the Role
We are hiring a Senior Systems Administrator to take primary ownership of hands-on systems administration, infrastructure implementation, and day-to-day user support across Mariana's corporate, field, and industrial sites. This is a foundational, builder-oriented role focused on establishing core capabilities like device management, centralized authentication, backup and disaster recovery, incident response, and change management. The role requires close coordination with various teams to deliver urgent requirements while supporting long-term infrastructure direction.
Responsibilities
- Administer Microsoft 365, Entra ID, and centralized authentication/SSO across corporate and field sites.
- Own the technical layer of SharePoint (permissions, architecture, governance) and manage user access, device provisioning, and onboarding/offboarding with HR.
- Maintain software and SaaS license management, including renewals, entitlements, and cost optimization.
- Establish end-to-end hardware lifecycle management — procurement, provisioning, tracking, and retirement — across offices, pilot facilities, and field sites.
- Configure and support routers, switches, firewalls, VPNs, and wireless networks across a multi-site environment, and drive network monitoring, segmentation, and IT/OT boundary improvements.
- Build and document backup/disaster recovery plans, security controls, vulnerability management, and a formal incident response and change management process.
- Coordinate and hold accountable managed service providers and consultants.
- Serve as the primary escalation point for complex user and site support issues, and develop help desk process, documentation, and SLAs.
- Mentor junior IT staff and build documentation/training that grows the team's overall technical depth.
Requirements
- 5+ years in systems and network administration with end-to-end ownership of infrastructure projects, not just ticket-based support.
- Deep hands-on experience with Microsoft 365 and Entra ID, including centralized authentication and SSO configuration.
- Strong networking fundamentals — VLANs/segmentation, firewalls, VPNs, wireless, routing/switching — with direct enterprise hardware experience.
- Working proficiency in PowerShell or similar scripting for administration and automation.
- Experience managing organization-level software/service licensing, including renewals and vendor coordination.
- A track record of building processes, systems, or tools from scratch, and comfort operating with incomplete documentation and ambiguity.
- Experience coordinating or overseeing managed service providers or outside consultants.
- Approximately 25% travel to Mariana’s other offices and project sites.
Skills
- Microsoft 365
- Entra ID
- Centralized authentication
- SSO configuration
- SharePoint administration
- User access management
- Device provisioning
- Onboarding/offboarding processes
- Software license management
- SaaS license management
- Hardware lifecycle management
- Router configuration
- Switch configuration
- Firewall configuration
- VPN configuration
- Wireless network configuration
- Network monitoring
- Network segmentation
- IT/OT boundary improvements
- Backup and disaster recovery planning
- Security controls implementation
- Vulnerability management
- Incident response process
- Change management process
- Managed service provider coordination
- Help desk process development
- Help desk documentation
- Service Level Agreements (SLAs)
- Mentoring junior staff
- Technical documentation
- Training development
- PowerShell scripting
- Apple/Mac device management
- Ubiquiti networking
Location
- Corporate sites
- Field sites
- Industrial sites
Work Type
- Full-time
Experience Level
- Senior
About the Company
- Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies.
- We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
- Our culture is built on four principles: Everyone Gets Home Safe, Extreme Ownership, Engineer Out Requirements, then Automate, and Share Your Legos.
- Join us as we build the future of responsible mineral sourcing and supply!