Quality Engineer; ONSITE in Mountain Pass

Job Description

MP Materials (NYSE: MP) is on a mission to restore the full rare earth supply chain to the United States of America. From electric cars to wind turbines and drones, rare earths are essential to the low‑carbon, electrified technologies that power modern life. We hire ambitious, mission‑driven people motivated to solve problems and affect change. Our values are grounded in teamwork, resiliency, and integrity, with an enduring commitment to our employees, community, and the environment.

In the coming years, MP Materials will grow from a core materials and chemical processing company into a large industrial manufacturer. Our employees will lead this exciting transformation and grow professionally with us.

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.

• 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

• BS or MS in chemical engineering or similar engineering discipline
• 3+ years of quality systems experience under relevant quality regimes in a manufacturing environment
• ISO 9001 Lead Auditor certification
• 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

• 3+ years experience in a quality or process engineering role in a heavy industrial chemical plant operation
• Experience implementing a QMS software solution
• Experience and management of root cause analysis, corrective, and preventative action programs
• Project management skills
• Accreditation by professional organizations
• Lean and Six Sigma experience
• Excellent verbal and written communication skills
• Proficient in…