Human Resources Manager

Why Castelion, Why Now 

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability. 

This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.  

Human Resources Manager

We are seeking a Human Resources Manager responsible for launching and supporting people operations of a new manufacturing facility during a period of rapid growth. This role is highly operational and partners directly with leadership to build a high-performing workforce, establish a strong employee culture, and ensure exceptional execution of day-to-day HR operations.

Responsibilities

Site Leadership Partnership

• Partner with leadership to execute workforce strategies that support production goals, organizational growth, and operational excellence.
• Coach and develop leaders to improve manager effectiveness, accountability, employee performance, and engagement.
• Provide data-driven HR guidance by identifying workforce trends, risks, and opportunities that improve business outcomes.

Employee Relations & Performance Management

• Lead complex employee relations matters and performance management activities, ensuring timely, consistent, and legally compliant resolutions.
• Strengthen manager capability through coaching on investigations, corrective actions, conflict resolution, and employee development.
• Foster a high-performance culture by driving accountability, consistent policy application, and proactive resolution of workplace issues.

Non-Exempt Workforce Support

• Serve as the HR expert for a large non-exempt manufacturing workforce, ensuring compliance with wage and hour laws, attendance, scheduling, and timekeeping practices.
• Analyze workforce metrics, including turnover, attendance, overtime, and engagement, to identify trends and implement operational improvements.
• Partner with leaders to proactively resolve workforce challenges that could impact productivity, staffing or employee retention.

Site Growth & Operations

• Support rapid site expansion by partnering with leaders to achieve hiring, onboarding, and workforce readiness objectives.
• Coordinate HR support for organizational growth, new production lines, shift expansions, and workforce changes while maintaining a consistent employee experience.
• Ensure company HR programs and initiatives are executed effectively and consistently across the Rio Rancho site.

HR Operations

• Execute core HR programs, including performance reviews, compensation, promotions, employee development, and policy administration with accuracy and timeliness.
• Partner cross-functionally with Payroll, Benefits and Talent Acquisition to deliver exceptional employee support and operational efficiency.
• Utilize workforce data and HR metrics to identify opportunities for continuous improvement and inform business decisions.

Compliance & Risk Management

• Ensure compliance with federal, New Mexico, and company employment requirements while minimizing organizational risk.
• Lead audits, investigations, documentation, and regulatory activities with accuracy, consistency, and timely execution.
• Partner with leaders and Environmental Health & Safety to proactively address workplace risks and maintain a compliant, safe work environment.

Basic Qualifications

• Bachelor's degree in Human Resources, Business, or related field.
• 6+ years of progressive Human Resources experience.
• 3+ years supporting manufacturing, production, distribution, or other operational environments with significant non-exempt populations.
• Strong experience coaching managers through employee relations, investigations, corrective actions, and performance management.
• Deep understanding of wage and hour laws affecting hourly employees.
• Experience partnering directly with Operations leaders in fast-paced environments.
• Ability to manage multiple priorities with minimal direction.
• Excellent communication and relationship-building skills.

Preferred Skills and Experience

• Experience supporting a new facility launch or major site expansion.
• Experience in aerospace, defense, manufacturing, or other highly regulated industries.
• Multi-state HR experience.
• Experience with HRIS systems such as Rippling, Workday, UKG, or similar.
• PHR, SPHR, SHRM-CP, or SHRM-SCP certification.

Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.  

Other Duties 

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice. 

Additional Eligibility Requirements 

This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply. 

Affirmative Action/EEO Statement 

Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law. 

Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact [email protected]. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law. 

Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation. 

EAR/ITAR Requirements 

This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.