EHS Technician

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 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) Technician provides hands on field support to manufacturing, R&D, and test operations by performing the day-to-day tasks that keep EHS programs running. This role reports directly to the EHS Manager and works in tandem with the EHS Specialist to cover the site, sharing field workload and coordinating daily priorities.

The EHS Technician spends most of the workday on the production floor and in test areas conducting inspections, servicing and staging safety equipment, handling hazardous materials and waste to accumulation area, and supporting training delivery. This role executes established program requirements instead of developing them, escalates hazards to the EHS Manager, and reinforces safe work practices in a fast paced, high hazard environment.

Castelion is seeking an individual who with the ability to collaborate with area owners to reduce safety risks across multiple departments.

• Perform daily and weekly walkthroughs of manufacturing, R&D, and test areas using approved checklists, documenting findings. Partner with EHS team on hazard identification and control selection.
• Coordinate daily and weekly coverage with the EHS Specialist so inspections, training, open ticket items, and field support are divided across the site without gaps or duplication.
• Verify condition and availability of PPE, lockout devices, eyewash and shower stations, fire extinguishers, and spill kits.
• Triage and maintain hazardous waste accumulation areas to include satellite area upkeep and staging containers for scheduled waste shipments.
• Assist employees with secondary container labeling and chemical storage segregation, maintenance of chemical inventory, to support hazard communication requirements.
• Support with on-site response actions where directed.
• Coordinate EHS training logistics including, room and material setup, attendance tracking, and records filing.

• High school diploma or equivalent, and one of the following:
• Associates degree or technical certificate in occupational health and safety, environmental science, industrial hygiene, or a related technical field
• Completion of a recognized EHS certificate program, military safety technical training, or apprenticeship
• Additional directly applicable hands on EHS experience in lieu of formal post-secondary education
• One to three years of hands on EHS, industrial hygiene, environmental, or safety support experience in manufacturing, research and development, construction, or industrial environment
• Familiarity with basic OSHA and Cal-OSHA workplace safety requirements
• Ability to accurately complete inspection forms, logs, and recordkeeping documentation
• Comfortable working on a production floor and in outdoor test environments, including standing, walking, climbing ladders, and lifting up to 50 pounds
• Ability to wear required PPE, including respiratory protection
• Ability to meet U.S. export control requirements (ITAR or EAR)

• Associate's degree in occupational health and safety, environmental science, or industrial hygiene
• 2+ of EHS experience in aerospace, defense, manufacturing, or another high hazard industry
• OSHA 10 or OSHA 30, DOT hazmat shipping, forklift, RCRA certifications, or first aid/CPR certifications
• Experience managing hazardous waste accumulation areas under RCRA or California hazardous waste requirements
• Experience working in a startup or fast paced 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…