Senior Engineer, Magnet Technology

Senior Engineer, Magnet Technology

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.

MP Materials is seeking a hands‑on Senior Engineer to lead the development and optimization of precision machining processes and dimensional control strategies for high‑performance, rare earth permanent magnets. This role is critical to enabling manufacturability of complex magnet geometries with micron‑level tolerances. The ideal candidate will bring deep expertise in geometric dimensioning and tolerancing (GD&T), statistical process control (SPC), and process capability analysis (e.g., Cpk, Ppk), along with hands‑on experience machining brittle materials.

• Lead the development and refinement of machining processes for cutting, grinding, shaping, and finishing of rare‑earth permanent magnets with tight dimensional tolerances and surface integrity.
• Apply advanced GD&T principles (ASME Y14.5) to interpret engineering drawings and ensure precise part geometry, flatness, concentricity, and perpendicularity.
• Collaborate with design and quality engineering to ensure DFM (Design for Manufacturability) of new magnet components.
• Conduct statistical analysis of machining data, including Cpk/Ppk, gauge R&R, and SPC charts, to monitor and improve process capability.
• Design and fabricate custom fixtures, jigs, and tooling to safely and accurately machine brittle, magnetized or demagnetized materials.
• Lead root cause analysis of dimensional defects and machining errors; develop corrective actions and continuous improvement plans.
• Implement process improvements to increase throughput, reduce scrap, and enhance dimensional control.
• Perform hands‑on prototyping and process trials, working directly with in‑house equipment and technicians.
• Conduct first‑article inspections and support dimensional validation using vision systems, micrometers, and other metrology equipment.
• Mentor junior engineers and technicians in GD&T interpretation, statistical analysis, and machining best practices.
• Work closely with EHS to ensure that all work is done to ensure world‑class health and safety, and full compliance with relevant environmental regulations.
• Other duties as assigned.

• Bachelor’s degree in Mechanical Engineering, Manufacturing Engineering, or a related field.
• 5+ years of hands‑on experience in precision machining and dimensional control, preferably involving brittle materials.
• Advanced proficiency in GD&T (ASME Y14.5 standard), blueprint reading, and tolerance stack‑up analysis.
• Proven experience with statistical analysis tools (e.g., R, Minitab) and process capability metrics (Cpk, Ppk).
• Experience designing and optimizing fixtures and tooling for complex geometries.
• Fluent with CAD/CAM tools (e.g., Solid Works).
• Strong understanding of machining challenges posed by brittle, hard, or magnetized materials.
• Strong analytical and problem‑solving skills; ability to work independently and as part of a cross‑functional team.
• Excellent written and verbal communication skills.

• Experience machining ceramics, intermetallics, composites, or rare‑earth magnets to micron‑level tolerances.
• Knowledge of advanced inspection techniques and digital metrology.
• Fa…