Senior Process Control Engineer-Onsite

Senior Process Control Engineer-Onsite

Full Time
Mountain Pass, CA, US

Salary Range: $ To $ Annually

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.

The Senior Process Control Engineer supports plant operations PLC/SCADA infrastructure, participates in various capital projects, and provides expertise on various process improvement projects. This position will be responsible for interfacing with stakeholders including engineering, production, maintenance, utilities, IT, environmental, safety, management, and contractors. This is an onsite position, Monday through Friday, with off‑shift on‑call support responsibilities that is shared amongst the controls group.

• Work within the PLC/SCADA environment to support plant operations.
• Update and develop new graphics within the SCADA GE iFix and Ignition HMI applications.
• Ladder logic, function block, and structured text programming in RSLogix.
• Support Ethernet‑based network infrastructure.
• Troubleshoot and installation support for actuated valves, instruments, various process equipment, remote I/O panels, SCADA servers & workstations.
• Review of engineering documents for capital and internal projects.
• Oversight of controls aspects of new construction activities.
• Follow design, project management, and document control standards.
• Design proper control schemes and strategies and work with process engineers to understand the plant operation requirements.
• Manage the PI data historian tag list, graphical displays, and reports.
• Work with operations to identify bottlenecks and create solutions.
• Complete any other tasks as needed or as directed by management.

• BS degree in Engineering, or a related field, preferred.
• 7+ years of experience as a process control engineer in a chemical, mining, petroleum, or heavy industrial setting.
• Must be authorized to work in the United States.
• A Valid Driver’s License and good driving record are required to drive company vehicles on the property.
• Demonstrated experience and competence in Rockwell Automation programming platforms.
• Experience with PFDs, P&IDs, control narratives, and instrumentation wiring diagrams.
• Full‑time onsite

• Work experience with Ignition (Perspective) and/or iFix HMI platforms, OSI Pi.
• Solvent Extraction, Chlor‑Alkali, or Co‑Gen power plant experience is a plus.
• Hands‑on experience with heavy industrial equipment troubleshooting.
• Experience with process optimization/tuning of closed‑loop control systems.

MP Materials is proud to be an Equal Opportunity / Affiant Action Employer – EEO is the law. 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.

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…