Senior Systems Administrator

Mariana Minerals
San Francisco, Houston
Workplace: OnsiteFull timeUSD 130,000 - 200,000 annuallyFunction: Administration & Executive AssistanceExperience: 5+ yearsSkills: ["Documentation","Mentoring","Process building","Incident response","Collaboration"]

Own and build the systems administration foundation across corporate, field, and industrial sites, including Microsoft 365 and Entra ID with centralized authentication/SSO, SharePoint governance, device provisioning, and software/SaaS licensing. Configure and improve multi-site networking (routers, switches, firewalls, VPNs, wireless, segmentation). Lead backup/disaster recovery, security controls, vulnerability management, and incident/change processes, while coordinating managed service providers and escalating complex support issues.

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FursaFursa
Mariana Minerals
Mariana Minerals
2 days ago

Senior Systems Administrator

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Last checked: 17 minutes agoStatus: Live

Job Summary

Own and build the systems administration foundation across corporate, field, and industrial sites, including Microsoft 365 and Entra ID with centralized authentication/SSO, SharePoint governance, device provisioning, and software/SaaS licensing. Configure and improve multi-site networking (routers, switches, firewalls, VPNs, wireless, segmentation). Lead backup/disaster recovery, security controls, vulnerability management, and incident/change processes, while coordinating managed service providers and escalating complex support issues.
Location: San Francisco, Houston
Workplace: Onsite
Employment Type: Full time
Job Function: Administration & Executive Assistance
Seniority: Mid level

Key Responsibilities

  • •Administer Microsoft 365 and Entra ID, and manage centralized authentication/SSO across corporate and field sites.
  • •Own SharePoint permissions, architecture, governance, and coordinate user access with HR.
  • •Maintain software and SaaS license management, including renewals, entitlements, and cost optimization.
  • •Establish end-to-end hardware lifecycle management (procurement, provisioning, tracking, retirement).
  • •Configure and support multi-site networking (routers, switches, firewalls, VPNs, wireless) and improve monitoring, segmentation, and IT/OT boundary controls; build DR plans and security/incident/change processes.
Travel: Medium travel

Pay and Benefits

Salary: USD 130,000 - 200,000 annually
Equity and Bonus:Equity

Key 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) for administration and automation.
  • •Experience managing organization-level software/service licensing, including renewals and vendor coordination.
Experience:5+ yearsMiningOTIndustrial
Skills:DocumentationMentoringProcess buildingIncident responseCollaboration
Tech Stack:Microsoft 365Entra IDSSOSharePointPowerShellRoutersSwitchesFirewallsVPNsWirelessVLANNetwork monitoringSegmentationIT/OT boundaryBackupDisaster recoveryIncident responseChange managementApple/MacUbiquiti

Company Brief

Mariana Minerals
Software-first, vertically integrated minerals company developing extraction, processing, and automation systems to supply critical minerals (lithium and others) for energy, AI, and defense technologies, and building commercial-scale lithium facilities from produced water.
Industry: Mining & Metals
Company Size: Small (11 to 50 employees)
Growth: Early Stage Startup
Funding: Series A
Headquarters: San Francisco, United States
WebsiteLinkedInGlassdoor