About Castelion

Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. We’re designing, building, and testing next generation long range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts.

Facilities Manager

We are seeking a highly proactive, hands-on Facilities Manager to own the day-to-day operations, maintenance, and continuous improvement of Castelion’s facilities. This role is critical to enabling safe, reliable, and scalable operations across engineering, manufacturing, and office environments. You will serve as the primary owner of facilities performance - balancing immediate operational needs with longer-term planning as the company rapidly grows.

The ideal candidate thrives in fast-paced environments, takes pride in operational excellence, and brings a strong sense of ownership, urgency, and attention to detail.

Responsibilities

Own all facilities operations across assigned sites, serving as the primary point of contact for facilities-related needs, issues, and improvements
Manage and prioritize work orders, ensuring timely resolution of maintenance, repair, and operational issues
Oversee building systems including HVAC, electrical, plumbing, lighting, janitorial, security, fire protection, and office/industrial equipment
Source, manage, and hold accountable external vendors and service providers for quality, cost, and schedule
Develop and maintain preventative maintenance plans, service schedules, and facility documentation
Ensure facilities comply with applicable safety, health, environmental, and building regulations
Partner with EHS, operations, and leadership to support safety inspections, audits, and corrective actions
Lead space planning efforts, office and lab moves, furniture layouts, and site expansions
Manage facilities-related purchasing, inventory, and budget tracking
Support emergency preparedness planning and incident response (fire drills, power outages, equipment failures)
Drive continuous improvement in facilities processes, responsiveness, and reliability as the company scales
Support special projects related to new site buildouts, expansions, or production ramp

Basic Qualifications

High school diploma or GED required; associate’s or bachelor’s degree preferred
5+ years of experience in facilities management, building operations, or related roles
Strong working knowledge of building systems (HVAC, electrical, plumbing, life safety)
Experience managing vendors, contracts, and service providers
Proven ability to operate independently with high ownership and accountability
Strong communication, organizational, and problem-solving skills
Ability to support off-hours or weekend work during critical operations or emergencies
Comfortable operating in fast-moving environments with shifting priorities
Bias to action, attention to detail, and commitment to building high-quality, reliable workspaces
Proficiency with Microsoft Office; experience with CMMS or facilities management software preferred

Preferred Skills and Experience

Experience supporting engineering, manufacturing, or industrial facilities
Familiarity with safety, environmental, and regulatory compliance in technical or production environments
Experience scaling facilities for a rapidly growing company or startup
Budget ownership or cost-tracking responsibility
Hands-on background with light maintenance, troubleshooting, or facilities projects

All employees are granted long-term stock incentives as part of their employment at Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers four weeks of paid time off per year.

Leadership Qualities

Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support.

High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion’s mission and consistently look for ways to contribute to the company’s technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.

Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.

ITAR Requirements:

To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State.

Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

Castelion

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