Warehouse Supervisor - Reagents & Bulk Materials

MP Materials Corp.; California; On-site; USD 90,000 - 110,000; Full time

Job summary

MP Materials Corp. is seeking a Warehouse Supervisor – Reagents & Bulk Materials at Mountain Pass, CA. The role oversees a team handling reagent and bulk material flow, ensuring safety, inventory traceability, and process discipline in a 24/7 operation.

The candidate will manage SAP transactions, verify PO/BOL/receipts, and coordinate with AP to keep materials moving. Minimum 3 years supervisory warehousing experience and SAP/ERP proficiency required.

Qualifications

• Bachelor’s degree in business, logistics, supply chain, or related field or 5 years of progressive experience in warehouse operations.
• Proven ability to lead teams, manage shift schedules, assess individual capabilities, and enforce strict team discipline.
• Minimum 3 years of experience supervising/managing warehouse operations.
• Strong experience with ERP and MRP systems. SAP is a plus.
• Direct experience operating in mining/refining/chemical processing or construction environment preferred.
• Solid working knowledge of OSHA/DOT guidelines for hazardous materials handling and storage.
• Advanced computer skills including Microsoft Office; ability to operate forklifts with required certifications.

Responsibilities

• Deliver accurate SAP / ERP system transactions to maintain inventory integrity.
• Enforce a same-day receiving standard to eliminate material backlogs.
• Maintain SOX compliance, safety mandates, and environmental expectations.
• Validate POs vs Bills of Lading vs physical material and coordinate with AP.
• Ensure inbound materials are labeled with PO number, material number, quantity and date.
• Coordinate daily reagent deliveries on kanban and allocate consumed materials.
• Support site inventory control activities including cycle counts and variance investigations.
• Lead daily receiving activities and monitor workloads.
• Act as a hands-on, inspirational leader in a fast-paced industrial environment.

Skills

Leadership

Team management

SAP

Safety compliance

Forklift operation

MS Office

Education

Bachelor’s degree in business, logistics, supply chain, or related field

Tools

SAP

Job description

Warehouse Supervisor - Reagents & Bulk Materials

Full Time Mountain Pass, CA, US

4 days ago Requisition ID: 2218

Salary Range: $90,000.00 To $110,000.00 Annually

Company Overview:

MP Materials (NYSE: MP) is rebuilding American industrial capability for a new era of autonomy, robotics, and electrification.

We are the only U.S. company with a fully integrated rare earth supply chain—from mining and refining to advanced metal and magnet manufacturing. Our products include both the critical materials used to make permanent magnets and the finished magnets themselves—enabling next-generation technologies in robotics, automation, aerospace, transportation, defense, and energy systems. These materials are the foundation of physical AI—the convergence of computation, movement, and control.

We hire ambitious, mission-driven people who want to tackle complex challenges and shape the future of strategic industries. Our culture is rooted in teamwork, resiliency, and integrity, with a deep commitment to operational excellence and national purpose. MP is rapidly evolving from a materials producer into a leading U.S. manufacturer—and our people are driving that transformation.

Position Overview:

The Warehouse Supervisor – Reagents & Bulk Materials provides end-to-end operational ownership of reagent and bulk material flow at the Mountain Pass facility. This role is responsible for driving strict safety compliance, inventory traceability, material availability, and process discipline. Based physically within one of the reagent warehouses, this supervisor oversees a dedicated team of operators ensuring operational efficiency and full alignment with company policy. The supervisor establishes clear operational ownership to support scalable, incident-free 24/7 warehouse operations.

Position Responsibilities:

• Deliver accurate SAP / ERP system transactions to maintain inventory integrity. Enforce a same-day receiving standard to eliminate material backlogs and ensure processing occurs within defined timeframes.
• Maintain full alignment with Sarbanes-Oxley (SOX) compliance, safety mandates, and environmental expectations to deliver incident-free operation.
• Perform precise validation checks comparing Purchase Orders (PO) vs. Bills of Lading (BOL) vs. physical material. Coordinate and communicate with Accounts Payable (AP) to ensure tight Goods Receipt (GR) vs. invoice validation.
• Ensure all inbound materials are labeled immediately upon receipt with the PO number, material number, quantity, and date.
• Partner with operations for daily reagent deliveries on kanban system and accurate allocation of consumed materials.
• Support site inventory control activities, including cycle counts, variance investigations, and authorized stock adjustments. Ensure all material or paperwork discrepancies are identified immediately at the point of receipt.
• Serve as the subject matter expert for reagent and bulk materials management activities and requirements, and other duties as assigned.
• Lead daily receiving activities and monitor workloads ensure the success of the crew.
• Act as a supportive and inspirational leader who can work independently with a high sense of urgency in a hands-on, active industrial team environment.

Required Experience:

• Bachelor’s degree in business, logistics, supply chain, or related field. Or 5 years of progressive experience in warehouse operations in an industrial environment.
• Proven ability to lead teams, manage shift schedules, assess individual capabilities, and enforce strict team discipline and execution.
• Minimum 3 years of experience supervising/managing warehouse operations.
• Strong experience with ERP and MRP systems. SAP is a plus.
• Direct experience operating in a mining, refining, chemical processing, or construction environment preferred.
• Solid working knowledge of industrial environmental health and safety standards, safety data sheet (SDS) compliance, and OSHA/DOT guidelines applying to hazardous materials handling and storage.
• Advanced computer skills including Microsoft Office. Ability to operate forklifts and obtain required operating certifications if needed.

MP Materials is Proud to be an Equal Opportunity / Affi

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, protected veteran status, or any other characteristic protected by law. Underrepresented groups/Women/Disabled/Veterans are encouraged to apply. Candidates whose disabilities make them unable to meet the position’s requirements will still be considered qualified if they can perform the essential functions of the job with reasonable accommodation.

Your Right to Work – In compliance with federal law, all persons hired will be required to verify identity and eligibility to work in the United States and to complete the required employment verification document form upon hire.

Safety Provision - Employees are responsible for following all company, industry and regulatory procedures and laws to ensure a safe work environment for themselves and the company. Employees must have a willingness to promote safety among the workforce, participate in Process Hazard Analysis procedures and Pre-Startup Safety Reviews.

(PPE) Personal Protective Equipment is required when performing work in a mine, manufacturing, outdoor, or plant environment. Required PPE may include, but is not limited to, hard hat, hearing protection, safety glasses, safety footwear, respirator, rubber steel-toe boots, protective clothing, gloves, and any other protective equipment as required.

Working Conditions - Our facility sits at an elevation of 4,700 feet. Employees may be subject to extreme weather conditions when working in an outdoor setting (heat and cold, wind). Work is at an open pit mine or manufacturing/chemical plant setting, which may include exposure to moving mechanical parts, toxic chemicals, risk of electrical shock, explosives, fumes, or airborne particles.

Physical Demands -Manual dexterity; sense of touch; sense of smell; speaking clearly; hearing-speech range; hearing – all ranges; seeing, reading and comprehensions; seeing – distant/near; depth perception; color vision. While performing the job responsibilities, the employee is required to talk and hear. The employee is often required to stand and use their hands and fingers, to handle or feel and to manipulate laboratory equipment. The employee is occasionally required to walk, reach with arms and hands, climb or balance, and to stoop, kneel, crouch or crawl. Vision abilities required by this job include close vision. Employees must pass a full-face respiratory fit test. Employees must be able to lift 50 lbs. Must be able to work in PPE level C. These requirements are representative, but not all-inclusive, of the knowledge, skill, and ability required of the employee.