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 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 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.

• 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.

• 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.

• 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

• 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.

• 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.

• 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…