EHS Specialist

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. The Environmental, Health & Safety (EHS) Specialist supports manufacturing, R&D, and test operations by executing and maintaining EHS programs that ensure safe, compliant day to day operations. This role provides hands on field support across the site, including conducting inspections, supporting training, managing hazardous materials and waste, and maintaining required records and permits. The EHS Specialist works closely with operations, engineering, and leadership teams to identify hazards, verify controls, and reinforce safe work practices in a fast paced, high hazard environment. This role plays a critical part in keeping people safe, maintaining regulatory compliance, and enabling the organization to operate efficiently as it scales. Key Responsibilities • Conduct routine safety and compliance inspections of manufacturing, R&D, and test areas to verify that approved controls, procedures, and permits are being followed and escalate higher risk conditions to the Senior EHS Engineer • Perform task walkdowns and document Job Hazard Analyses (JHAs) using approved formats, ensuring job steps, hazards, and controls are accurately captured and kept current • Verify proper use and condition of PPE, guarding, lockout devices, ventilation, gas monitors, and other safety controls during daily operations • Support PPE programs by assisting with PPE assessments, coordinating fittings and issuance, delivering PPE training, and verifying proper use and condition • Support implementation and maintenance of EHS programs, plans, and procedures by maintaining required records, permits, postings, and inspection logs • Support industrial hygiene activities by deploying sampling equipment, collecting exposure data, coordinating laboratory analysis, and maintaining monitoring records • Support incident, near miss, and injury investigations by gathering facts, documenting events, and tracking assigned corrective actions to closure • Schedule, deliver, and document EHS training including onboarding, refresher, and task specific training • Manage hazardous waste accumulation areas including container labeling, inspections, inventory tracking, and coordination of waste shipments • Maintain chemical inventories, Safety Data Sheets, and container labeling to support hazard communication and chemical management • Support environmental reporting and permit compliance by maintaining required records, conducting routine inspections, and coordinating submittals and renewals as directed • Support site emergency preparedness and response activities by maintaining emergency equipment, participating in drills, and assisting with on scene response actions as directed Required Qualifications • Associate’s or Bachelor’s degree in occupational health and safety, environmental science, or a related field • 1 to 3 years of experience supporting EHS programs in manufacturing, laboratory, or industrial environments • Working knowledge of OSHA or Cal-OSHA requirements • Strong organizational and communication skills • Willingness and ability to travel periodically to support operations at other locations as needed • Ability to meet U.S. export control requirements (ITAR or EAR) Preferred Qualifications • Experience in aerospace, defense, or other high hazard industries • OSHA 30, HAZWOPER, or similar safety training • Experience working in a startup or fast paced environment All employees are granted long-term stock incentives as part of their employment at Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers four weeks of paid time off per year. Leadership Qualities Bias 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. 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 hr@castelion.com. 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.