Senior Systems Administrator

About Mariana Minerals

Mariana Minerals is a software-first, vertically integrated minerals company dedicated to supplying critical minerals essential for modern energy, AI, and defense technologies. We aim to revolutionize the minerals supply chain through advanced software, automation, and data-driven decision-making.

The Role

We are seeking a Senior Systems Administrator to oversee the technical aspects of our operations, including systems administration, infrastructure implementation, and user support. This role is foundational and builder-oriented, focusing on long-term infrastructure direction rather than routine tasks. The position involves working closely with Controls/OT engineering, Software Engineering, HR, managed service providers, and on-site stakeholders to address urgent needs while aligning with broader strategic goals.

What You'll Do

• 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
• Cook up and document processes for managing 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

Desired Qualifications

• 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

PREFERRED

• Experience in industrial/mining/OT-adjacent environments
• Familiarity with NIST SP 800-171/CMMC/ISO 27001
• Experience with Apple/Mac devices and Ubiquiti networking

Compensation Range

$130K - $200K