Environmental Manager

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.  

Environmental Manager

The Environmental Manager is responsible for building and leading Castelion's company-wide environmental function as part of the Environmental, Health & Safety (EHS) organization. Serving as the company's primary environmental subject matter expert, this role establishes the environmental strategy, develops company-wide policies, standards, and management systems, leads environmental permitting efforts, and provides technical guidance on environmental compliance across all operating locations.

Working closely with Site EHS Managers, Engineering, Manufacturing, Facilities, Test Operations, Supply Chain, and Program Management, this individual integrates environmental requirements into facility planning, process design, operational readiness, manufacturing, testing, and expansion projects. The Environmental Manager develops practical, risk-based environmental solutions that enable operational execution while meeting environmental obligations and building the environmental function to support Castelion's continued growth.

Responsibilities

Environmental Leadership

• Lead and continuously improve Castelion's environmental function in support of company growth.
• Establish environmental strategy, governance, and management systems aligned with business objectives.
• Serve as the company's primary environmental subject matter expert, providing technical guidance to leadership and Site EHS Managers.
• Develop environmental performance metrics and drive continuous improvement across all operating locations.
• Build and mentor a scalable environmental organization as the company grows.

Permitting, Due Diligence & Regulatory Strategy

• Develop permitting strategies that support new facilities, manufacturing operations, testing, and future expansion.
• Lead environmental due diligence for new sites, acquisitions, leases, and development projects.
• Manage environmental permits and regulatory approvals throughout their lifecycle.
• Build productive relationships with environmental regulatory agencies and coordinate consultant support.
• Monitor emerging regulatory requirements and advise leadership on business impacts.

Environmental Programs

• Develop, implement, and oversee company-wide environmental programs, including:
• Air quality compliance and permitting
• Hazardous waste management, including characterization of complex and unique waste streams
• Industrial stormwater (SWPPP), SPCC, wastewater, and EPCRA compliance
• Environmental inspections, monitoring, and regulatory reporting
• Environmental Management Systems (EMS) aligned with ISO 14001 principles

Operational Partnership

• Partner with Engineering, Manufacturing, Facilities, and Operations to integrate environmental requirements into projects and production.
• Support site selection, facility design, startup, commissioning, and operational readiness activities.
• Evaluate environmental impacts associated with new processes, equipment, chemicals, and production changes.
• Identify permitting and compliance requirements early to support efficient project execution.
• Provide practical environmental solutions that enable innovation and operational success.

Environmental Risk & Continuous Improvement

• Lead environmental audits, assessments, and regulatory inspections.
• Investigate environmental incidents and drive corrective and preventive actions.
• Assess environmental risks and recommend mitigation strategies for existing and future operations.
• Promote lessons learned, pollution prevention, and environmental stewardship throughout the organization.

Basic Qualifications

• Bachelor's degree in Environmental Engineering, Environmental Science, Chemical Engineering, Civil Engineering, or a related technical discipline.
• 10+ years of progressive leadership and technical environmental experience supporting manufacturing, aerospace, defense, semiconductor, chemical processing, or other complex industrial operations.
• Demonstrated experience developing and implementing Environmental Management Systems (EMS), including programs aligned with ISO 14001 principles.
• Extensive knowledge of federal, state, and local environmental regulations governing industrial operations.
• Demonstrated experience obtaining, maintaining, and managing environmental permits and regulatory compliance programs.
• Experience supporting environmental due diligence for new facilities, property acquisitions, leases, or facility expansions.
• Experience managing hazardous waste programs, including characterization and management of complex or unique hazardous waste streams.
• Demonstrated ability to interpret environmental regulations and translate them into practical, risk-based operational solutions.
• Excellent written and verbal communication skills, with the ability to communicate complex environmental and regulatory concepts to technical and non-technical audiences.
• Highly organized with exceptional attention to detail and the ability to manage multiple priorities in a fast-paced environment.
• Strong project management, critical thinking, and problem-solving skills.
• Proven ability to build collaborative relationships, influence cross-functional teams, and drive environmental initiatives from concept through implementation.
• Ability to thrive in a fast-paced, high-growth environment while balancing strategic priorities with day-to-day operational support.
• Willingness to travel between company operating locations as needed.

Preferred Skills and Experience

• Demonstrated experience developing and managing complex air quality permitting programs, including preparation, negotiation, modification, and ongoing compliance for major industrial operations.
• Demonstrated experience permitting complex manufacturing or industrial operations under one or more of the following regulatory agencies: SCAQMD, TCEQ, and/or NMED
• Experience supporting greenfield facility development, manufacturing startups, or major facility expansions from planning through operational readiness.
• Experience supporting aerospace, defense, propulsion, energetics, or other high-consequence manufacturing environments.
• Experience with emissions inventories, air dispersion modeling, and long-term air permitting strategy.
• Professional certifications such as:
• Certified Hazardous Materials Manager (CHMM)
• Registered Environmental Manager (REM)
• Qualified Environmental Professional (QEP)
• Professional Engineer (PE)

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 [email protected]. 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.