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Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not just concepts.

This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact.

The Environmental, Health & Safety (EHS) Engineer provides hands-on and technical EHS support for Castelion's Midland manufacturing and test operations, including energetic material processing, mix and cast operations, equipment and process safety, and test activities.

This is a highly field-oriented role responsible for both the day-to-day execution of EHS programs and the technical evaluation of operational risk. The EHS Engineer will spend significant time where the work is performed, partnering directly with manufacturing, test, engineering, and facilities teams to identify hazards, develop practical controls, and ensure EHS requirements are effectively implemented.

The successful candidate will be comfortable moving between the field and technical discussions, whether conducting an inspection, supporting a test operation, investigating an incident, developing a JHA, or working with engineers to evaluate hazards associated with a new and evolving processes, equipment, etc.

• Provide daily, hands-on EHS support for manufacturing, mix and cast, test, maintenance, and facility operations, maintaining a strong presence in operational areas.
• Identify and evaluate workplace and process hazards and partner with engineering and operations teams to develop practical engineering, administrative, and procedural controls.
• Lead and support risk assessments, including JHAs, PHAs, equipment/process reviews, and readiness assessments for new, modified, and higher-risk operations.
• Support new equipment, process changes, commissioning, and first-time operations by evaluating EHS risks and ensuring appropriate controls are established before work begins.
• Execute and maintain core EHS programs including LOTO, machine safety, PPE, respiratory protection, Hazard Communication, electrical safety, hot work, fall protection, material handling, and emergency preparedness.
• Conduct routine field inspections and operational walkdowns to verify controls are effective, identify emerging risks, and drive corrective actions to closure.
• Support energetic manufacturing and test activities by evaluating operational hazards and implementing requirements established through EHS and Energetics Safety reviews.
• Lead and support incident and near-miss investigations, identify root causes, develop corrective actions, and verify their effectiveness.
• Support industrial hygiene activities, including exposure assessments, sampling, evaluation of results, and implementation of exposure controls.
• Manage day-to-day environmental compliance activities including hazardous waste, chemical inventories, spill prevention, inspections, and required records.
• Support site compliance with applicable ATF explosives requirements, including routine inspections, explosives storage and inventory controls, required records, operational compliance, and corrective actions in coordination with EHS and Energetics Safety leadership.
• Develop and deliver EHS training and provide direct field coaching to employees, technicians, engineers, and supervisors.
• Develop and improve site procedures, JHAs, work instructions, and other EHS documentation based on operational needs and lessons learned.
• Serve as an accessible onsite EHS resource who can independently resolve routine issues, recognize when additional technical expertise is required, and escape significant risks appropriately.

• Bachelor's degree in engineering, occupational safety, environmental health and safety, industrial hygiene, environmental science, or a related technical field.
• 3+ years of EHS, safety engineering, manufacturing safety, process safety, or related experience in manufacturing, aerospace, defense, chemical processing, or other industrial environment.
• Working knowledge of OSHA requirements and common industrial EHS programs.
• Experience conducting hazard assessments, inspections, incident investigations, and corrective action management.
• Ability to understand manufacturing processes, equipment, and technical documentation and translate identified hazards into practical controls.
• Strong problem-solving, organizational, and communication skills.
• Comfortable working in field. and in outdoor test environments.
• Ability to work full-time onsite in Midland, Texas and support operations outside normal business hours when required
• Ability to meet U.S. export control requirements (ITAR or EAR)

• Experience in aerospace, defense, energetic materials, chemical processing, propulsion, or other high-hazard manufacturing environments.
• Experience supporting mix/cast, energetic material processing, propulsion manufacturing, or test operations.
• Experience with structured hazard assessment methods such as PHA, What-If, FMEA, or similar techniques.
• Familiarity with process safety, Management of Change, or equipment commissioning.
• Experience with industrial hygiene, hazardous waste, and environmental compliance.
• Familiarity with ATF, NFPA, or DoD explosives safety requirements.
• OSHA 30, HAZWOPER, ASP, CSP, or similar training or certification.
• Experience working in a startup or rapidly scaling manufacturing environment.

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.

All full-time employees are granted meaningful long-term equity, sharing in the company's significant growth trajectory. We offer four (4) weeks of paid time off, ten (10) company-paid holidays, and comprehensive health benefits - including 100% employee-covered medical and strong dependent coverage, along with dental and vision plans. We also provide paid parental leave to support growing families, a $100 monthly fitness stipend to promote health and performance, and onsite EV charging for convenience. In addition, employees enjoy perks like catered meals, company-covered food during high-demand periods, and a fully stocked kitchen to stay fueled throughout the day.

While this position does not currently require a U.S government-issued security clearance, it may in the near future. Therefore, the ability to obtain and maintain a U.S. government–issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

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.