EHS Site Manager

About CastelionCastelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. We're designing, building, and testing next generation long range strike weapon systems to give America and its Allies a definitive edge and deter future conflicts.EHS Manager (Rio Rancho)The EHS Manager will lead Environmental, Health, and Safety efforts for Castelion's Rio Rancho, New Mexico facility, supporting solid rocket motor manufacturing, integration, and test operations. This role is responsible for building and managing site EHS programs to ensure safe operations and regulatory compliance within a fast-paced, high-hazard manufacturing environment.The EHS Manager will play a key role in facility startup, commissioning, and ramp to production, partnering closely with operations, engineering, and leadership to embed safety and environmental stewardship across development and manufacturing. The ideal candidate brings experience in process safety, hazard analysis, and regulatory compliance in aerospace, manufacturing, energetics, or other high-consequence environments, and will also provide periodic EHS support to Castelion's Midland, Texas test facility.ResponsibilitiesServe as the EHS leader for the Rio Rancho facility, responsible for developing and managing site EHS programs, systems, and policies to ensure safe operations and regulatory compliance.Lead EHS planning and execution during facility startup, commissioning, and ramp to production, partnering with operations and engineering to integrate safety and environmental requirements into processes, equipment, and daily operations.Develop and maintain process safety and risk management programs, including hazard analyses (HAZOP, LOPA, FMEA) and risk assessments to identify and mitigate operational hazards.Ensure compliance with OSHA, EPA, ATF, NFPA, and applicable state and local regulations, including oversight of environmental programs such as hazardous waste, air emissions, stormwater management, and regulatory reporting.Implement and continuously improve safety programs through audits, inspections, training, and safety initiatives that strengthen operational discipline and safety culture.Lead incident investigations and root cause analysis for safety or environmental events, implementing corrective and preventive actions and maintaining site emergency response plans and preparedness.Provide periodic EHS support to Castelion's Midland, Texas facility, including audits, incident support, and program development as needed.Basic QualificationsBachelor's degree in Environmental Health & Safety, Environmental Engineering, Chemical Engineering, Industrial Engineering, Safety Engineering, or a related technical field.5+ years of experience supporting EHS and process safety programs in manufacturing, test, or other high-hazard operational environments.Experience implementing process safety management and hazard analysis techniques (HAZOP, LOPA, FMEA).Strong working knowledge ofOSHA, EPA, ATF, NFPA, and applicable state and local regulations.Experience leading incident investigations and corrective action programs.Hands-on experience developing and implementing EHS programs in manufacturing or test environments.Strong communication and leadership skills with the ability to influence cross-functional teams.Willingness and ability to travel periodically to support Midland, Texas operations.Preferred Skills and ExperienceProfessional certification such as CSP, CIH, or similar.Experience supporting solid rocket motor manufacturing, propulsion systems, energetics, or explosive/high-energy material operations.Experience supporting facility startup, commissioning, or greenfield manufacturing site development.Familiarity with EHS management systems such as ISO 14001 and ISO 45001.Experience applying continuous improvement and risk-based safety methodologies.All employees are granted long-term stock incentives as part of their employment as Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers three weeks of paid time off per year.Leadership QualitiesBias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support.High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion's mission and consistently look for ways to contribute to the company's technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.ITAR Requirements:To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State.Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.