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Sr. Systems Administrator

Mariana Minerals· Software Development
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San Francisco HQ, Houston, TX, Moab, UT$130k - $200kFull-timePosted 1mo ago

About the role

Senior level systems administrator responsible for hands-on infrastructure, device management, centralized authentication, backup and DR, incident response, and change management across corporate, field, and industrial sites. Partners with Controls/OT, Software Engineering, HR, and MSPs to build foundational IT capabilities while supporting longer-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

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, and experience with Apple/Mac devices and Ubiquiti networking
  • This role requires approximately 25% travel to Mariana’s other offices and project sites

Skills

Required:Microsoft 365Entra ID / SSOSharePoint administrationNetworkingPowerShell / scripting
Last updated Oct 14, 2026. Interested? Apply on the company site.

About Mariana Minerals

We to the Future of Minerals, verify the mineral supply chain.

Mariana Minerals is a software-first, vertically integrated minerals company focused on supplying the minerals critical to modern energy, AI, and defense technologies.

software-firstmineralsenergyAIdefense
Company profileWebsite

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