Want to know if this job is worth applying to?
San Francisco, California, United States
Onsite
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.
Mariana is hiring a Procurement Manager to own procurement for our new projects and pre-operational sites. This is a senior, self-directed role requiring deep technical and commercial experience in industrial procurement.
In this role, you will ensure sites have the supply agreements, vendor relationships, and procurement coverage they need before they go live. You will work across engineering, operations, and commercial functions to translate project needs into executed contracts, and identify sourcing opportunities across the portfolio. This role covers operating supplies, consumables, and non-construction capital spend. Construction and fixed equipment procurement are owned by the Capital Projects team.
What You’ll Do
Work directly with engineering and technical teams to define procurement requirements for pre-operational sites; translate technical specifications into sourcing scope
Own end-to-end pre-operational procurement: qualify vendors per established policy frameworks, run RFQ and competitive bid processes, negotiate pricing and contract terms, execute purchases, manage first deliveries
Procure operating supplies and consumables (including reagents and spare parts) and non-construction capital spend (including mobile equipment)
Ensure all contracts are reviewed for policy compliance and enterprise-level alignment prior to execution; flag clauses with broader implications
Own vendor relationships through the pre-operational phase; ensure clean handoff to on-site procurement as sites become operational
Support on-site procurement on complex purchases, high-value negotiations, and new project scope at existing operational sites
Lead cross-site consolidation sourcing events to identify and capture volume-based savings opportunities
Contribute quote data and supplier information to the organization's pricing and market intelligence database
Coordinate across site and project teams to ensure continuity of supply through startup and into operations
Desired Qualifications
Bachelor's degree in engineering, materials science, chemistry, or a related technical field required. Candidates without a degree who can demonstrate equivalent technical depth through experience will be considered.
8-12+ years of experience in procurement, project procurement, or capital purchasing in mining, industrials, chemicals, or a related sector
Proven track record of owning pre-operational or greenfield site procurement from spec to first delivery
Strong technical background with the ability to read specifications, understand process requirements, and engage credibly with engineering teams
Excellent negotiation skills with a track record of securing favorable terms under time pressure and without a large team behind you
Highly organized with the ability to manage multiple concurrent procurement workstreams across different projects and sites
Comfortable operating with ambiguity and limited structure; takes ownership and figures it out
Proficient with software tools for project tracking, workstream management, and reporting
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
