EHS Engineer Rio Rancho, Mexico EHS

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) Engineer provides hands-on and technical EHS support for Castelion's Project Ranger operations in New Mexico. The role spans facility construction and buildout, manufacturing, maintenance, facilities, engineering, commissioning, and other site operations.

Project Ranger is a rapidly developing manufacturing site. Facilities, equipment, processes, and operational requirements will continue to evolve as the site moves from construction and commissioning into sustained manufacturing. The EHS Engineer must be comfortable working through ambiguity, adapting to changing priorities, and building practical EHS systems that keep pace with the site.

This is a highly field-oriented role. The EHS Engineer will spend significant time where the work is performed, partnering with operators, technicians, engineers, maintenance, facilities, construction partners, and supervisors. Together they identify hazards, develop practical controls, and make sure EHS requirements are effectively implemented. On a given day that may mean conducting an inspection, reviewing equipment design, participating in a PHA, investigating an incident, or coaching an employee.

• Provide daily, hands-on EHS support across construction and buildout, manufacturing, maintenance, facilities, engineering, commissioning, and supporting operations, maintaining a strong presence in operational areas.
• Serve as an accessible onsite EHS resource for employees, contractors, and leadership. Independently resolve routine issues, recognize when specialized expertise is needed, and escalat[e] significant risks appropriately.
• Partner with facilities, engineering, construction teams, and contractors to identify and control EHS risks associated with facility construction, equipment installation, infrastructure development, and site modifications.
• Participate in facility, equipment, and process design reviews, and ensure EHS considerations are built into equipment procurement, installation, and modification before construction or startup.
• Support new equipment, process changes, commissioning, turnover, pre-startup reviews, and first-time operations, ensuring EHS controls are established before work begins.
• Identify and evaluate workplace, equipment, process, chemical, construction, and operational hazards, including machine guarding, hazardous energy, electrical, ergonomics, material handling, and access/egress. Partner with engineering and operations to develop practical engineering, administrative, and procedural controls.
• Lead and support risk assessments, including JHAs, PHAs, What-If analyses, equipment/process reviews, and operational readiness assessments for new, modified, and higher-risk operations.
• Support Management of Change processes so that changes to equipment, processes, facilities, materials, procedures, or operating conditions are evaluated before implementation.
• Develop, implement, and continuously improve site EHS SOPs, programs, policies, JHAs, work instructions, and inspection tools based on regulatory requirements, operational needs, risk assessments, and lessons learned.
• Develop and deliver EHS training for employees, contractors, technicians, engineers, supervisors, and managers. Work directly with affected teams to roll out new programs, verify that requirements are practical, and reinforce expectations through field coaching.
• Execute and maintain core site EHS programs, including LOTO, machine safety, PPE, respiratory protection, Hazard Communication, electrical safety, hot work, fall protection, confined space, material handling, contractor safety, and emergency preparedness and response.
• Conduct routine field inspections and operational walkdowns to verify that controls are effective and to identify emerging risks. Track findings and corrective actions, and work with responsible teams to prioritize them and drive them to closure.
• Lead and support incident and near‑miss investigations.…