Quality Engineer; ONSITE

Mountain Pass, CA, US

Salary Range: $ To $ 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 Quality Engineer will be a member of the process engineering team based in Mountain Pass, California. This role is primarily responsible for driving process quality, improving product consistency, and supporting plant operations through data-driven quality engineering practices. The successful candidate will be highly organized and detail-oriented with experience in the plant operations quality control, and the sustainment of Quality Management Systems (QMS) in compliance with internal, customer, and certification body requirements.

Position Responsibilities:

• Apply and promote industry best practices in the implementation and sustainment of the Quality Management System (QMS) for the Mountain Pass Mine and Processing Facility
• Collaborate with plant process engineers and operations to understand the specific elements, compounds, ratios, and purity requirements for feed sources and product streams; track critical inputs and outputs to ensure on spec product packaging, approaching 100% first time, on-spec production
• Ensure the QMS is compliant with all required third party standards/requirements, primarily ISO 9001 certification
• Lead the internal audit program, including participating in audit planning, execution, and reporting, and actively contribute with third-party certification and audit activities
• Collaborate closely with customer reps to ensure that the QMS is compliant with all customer requirements and integrated as needed with customer systems
• Lead non-compliance corrective action activities from internal and external (customer, supplier, and certification) audits
• Ensure that all in-house systems and procedures are updated, revised, and modified as needed to meet the needs of internal workforce, customers, and external certification bodies
• Drive improvements to the internal document control program, ensuring all policies, procedures, and other document types that impact safety, environmental compliance, and production quality are controlled per internal and ISO 9001 requirements
• Coordinate and execute the Management Review process, including preparation of inputs, reporting, and record retention, in compliance with ISO 9001
• Maintain and update controlled documents, including the Quality Manual & Policy, Risks and Opportunities, and Interested Parties review
• Responsible for ensuring the latest ISO 9001 standard revision and amendments are obtained, reviewed, and integrated with the mine site QMS
• Develop and implement quality systems learning and training tools
• Any other task as directed by management

Basic Qualifications:

• BS or MS in chemical engineering or similar engineering discipline
• 3+ years of quality systems experience under relevant quality regimes in a manufacturing environment
• Experience managing both internal and external (customer and surveillance) audits
• Understanding of standard manufacturing and safety compliance processes
• Valid driver’s license to drive company vehicles on and off property

Desired Qualities:

• 3+ years experience in a quality or process engineering role in a heavy industrial chemical plant operation
• Experience…