Senior Human Resources Generalist

About the Company

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.

About the Role

The Senior Generalist, Human Resources provides expertise and support from our Las Vegas Corporate office across all areas within Human Resources, serving as an ambassador for the organization. This role plays an integral part in the employee and candidate experience through the recruiting and human resources lifecycle—from sourcing and screening to onboarding, benefits, and HR virtual/on-site experiences. The Senior Generalist supports strategic and operational HR expertise while ensuring compliance with corporate policies, federal, state, and local regulations, and SOX requirements. This role serves as a trusted advisor to employees, helping drive HR programs that align with business objectives, enhance performance, and mitigate organizational risk.

Responsibilities

• Support various HR areas with ad hoc projects and tasks, including operations, compensation and benefits, talent development and training, employee engagement, and other functions.
• Identify and drive continuous improvement initiatives by evaluating HR processes, systems, and procedures, proposing solutions, and ensuring their completion.
• Facilitate tasks for onboarding, new-hire orientation, and exit interviews, including data entry in HRIS and audits for accuracy and compliance.
• Assist in preparing HR-related metrics, reports, and documentation for management, auditors, and stakeholders.
• Assist with system integration and optimization efforts for HR, including task tracking, documenting, monitoring timelines, reviewing resource needs, and driving results to completion.
• Provide coaching and guidance on HR policies, procedures, and employment law.
• Provide guidance on goal setting, employee development, and career progression.
• Manage full-cycle recruiting, including strategic planning with hiring teams, sourcing candidates, interviewing, screening, coordinating the selection and offer letter process, and supporting hiring requirements.
• Partner with business leaders to understand operations and define candidate talent requirements and sourcing approaches.
• Collaborate with HR cross-functional teams to create job descriptions, prepare offers, handle internal mobility, and other recruiting cycle activities.
• Develop optimal processes to maintain accurate and up-to-date records of candidate information in the applicant tracking system.
• Perform other duties as assigned.

Requirements

• Minimum 4 years of Human Resources experience, with at least 2 years in a generalist or senior generalist role, preferably in a public company or regulated environment.
• Bachelor’s degree in Human Resources or a relevant field of study.
• Proficiency using ADP and/or other HR systems and technology.
• Demonstrated ability to effectively partner with HR cross-functional teams, business operations, and other stakeholders.
• Demonstrated ability to interpret information, make suggestions, and drive change.
• Excellent written and verbal communication skills.
• Strong time management skills and ability to remain responsive in a vibrant, multi-task environment.

Desired Qualities

• Experience and/or strong knowledge of overall Recruiting/HR practices, such as compensation, benefits, talent management, DEI, and HR operations.
• Experience working directly with or for senior leadership positions.
• Proactive and solution-oriented mindset.
• Ability to balance strategic thinking and hands-on execution.
• Experience developing and/or maintaining relationships with external organizations.
• General project management skills and/or experience launching initiatives and programs.
• Strong proficiency in Microsoft Office suite, including Excel, HRIS, and HR reporting tools.
• Ability to maintain strict confidentiality and exercise sound judgment.

Location: Las Vegas Corporate Office, 1700 South Pavilion Center Dr. 8th Floor, Las Vegas, NV 89135.