Industrial Hygienist

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.

About The Role

Castelion is seeking an Industrial Hygienist to support our headquarters and manufacturing operations in Torrance, California. This individual will serve as a technical resource for industrial hygiene and occupational health across a diverse environment that includes advanced manufacturing, composites and materials, machining, research and development, avionics and dev test operations. Reporting to the Site EHS Manager, the Industrial Hygienist will work closely with Engineering, Manufacturing, Facilities, and EHS team members to identify and characterize workplace exposures, establish effective controls, and integrate industrial hygiene considerations into new and evolving processes. This is a hands-on role requiring regular engagement with employees and operations to understand how work is performed and translate technical industrial hygiene principles into practical solutions.

Responsibilities

• Develop and execute the site's industrial hygiene program, including exposure assessment strategies, sampling plans, monitoring, documentation, and periodic reassessment.
• Conduct qualitative and quantitative assessments of chemical and physical hazards across manufacturing, R&D, laboratory, and supporting operations, including airborne contaminants, noise, and non-ionizing radiation.
• Establish risk-based exposure monitoring strategies, including similar exposure groups, baseline characterization, monitoring frequencies, and reassessment criteria.
• Evaluate occupational exposure risks associated with advanced materials, chemicals, manufacturing processes, and emerging R&D activities, including situations where established exposure information may be limited.
• Partner with Engineering, Manufacturing, and Facilities to identify and implement effective engineering and process controls using the hierarchy of controls.
• Evaluate the effectiveness of ventilation, containment, and other exposure-control systems and provide technical recommendations for improvement.
• Provide industrial hygiene input during new equipment, material, process, and facility reviews to ensure occupational health considerations are incorporated early in design and implementation.
• Serve as a technical resource for respiratory protection, PPE selection, occupational exposure limits, noise and hearing conservation, non-ionizing radiation, and medical surveillance requirements.
• Apply and interpret applicable OSHA and Cal/OSHA requirements and recognized industrial hygiene standards and guidance, including ACGIH, NIOSH, ANSI, and AIHA practices, to establish technically sound exposure assessment and control strategies.
• Analyze and interpret exposure monitoring data, toxicological information, and occupational exposure limits to develop practical recommendations and communicate risk to employees and leadership.
• Develop industrial hygiene procedures, technical guidance, training, and employee communications supporting occupational health programs.
• Support investigations involving potential employee exposures, occupational health