Facilities Technician

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.

We are seeking an entry level Facilities Technician support the daily operation, maintenance, and readiness of Castelion’s Midland, Texas site. This role combines hands‑on facilities maintenance with day‑to‑day site coordination and is best suited for someone who is comfortable working with tools, troubleshooting basic building issues, supporting contractors, and jumping in wherever needed to keep the site operational.

The Facilities Technician will support the lead technician and facilities manager to maintain the buildings, utilities and services to support the test site personnel to perform their functions. Customer Service is the key mind set with a willingness to be trained in building maintenance across electrical, plumbing, HVAC, mechanical, and facility systems.

This is a highly dynamic role where no two days will look the same. The ideal candidate has some experience and training in at least one of the following categories Plumbing, Electrical or HVAC .

This is a full-time, on-site position requiring the ability to work indoors and outdoors in varying weather conditions and flexibility to support changing site priorities and occasional needs outside of standard business hours.

• Perform basic hands-on building and facilities maintenance, including minor electrical, plumbing, HVAC, mechanical, carpentry, hardware, and general repair work within appropriate skill and authorization levels
• Conduct regular site and building walkthroughs to proactively identify maintenance, safety, cleanliness, organization, and site-readiness issues and drive them through resolution
• Use common hand and power tools to perform minor repairs, installations, adjustments, assembly, and preventative maintenance activities
• Assist the Facilities Manager with preventative maintenance activities and routine inspection of building systems, equipment, and site infrastructure
• Support facilities projects, equipment installations, contractor activities, site improvements, and other field work as needed
• Coordinate and escort facilities vendors and contractors, verify work completion, and communicate outstanding issues or follow-up requirements
• Submit, track, and follow up on facilities requests and work orders to ensure issues are resolved in a timely manner
• Coordinate recurring site services, including janitorial, waste services, pest control, water service, landscaping, portable restrooms, and other operational services
• Partner with EHS, Security, Operations, and other site teams to safely coordinate facilities activities and maintain an operationally ready environment

• Technical training in Plumbing, Electrical or HVAC in commercial building environment.
• Hands‑on experience using common hand and power tools
• General working knowledge of building systems, including electrical, plumbing, HVAC, mechanical systems, and general building maintenance
• Ability to identify when maintenance issues require escalation to a licensed trade or specialized contractor
• Experience supporting preventative maintenance, inspections, repairs, or general facility upkeep
• Comfortable working in both office and industrial environments
• Ability to safely lift and carry up to 50 lbs.
• Ability to climb and work from ladders and perform physical tasks including bending, reaching, standing, walking, and moving materials
• Ability and willingness to work outdoors in hot, cold, and changing weather conditions
• Ability to work independently while maintaining strong communication with the Facilities Manager and broader site team
• Basic proficiency with Microsoft Office
• Willingness to support occasional needs outside of standard business hours

• Trade Training of some kind related to building maintenance.
• Experience performing preventative maintenance on building systems or facility equipment

Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.

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.

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.

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 View email address on click.appcast.io. 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.

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.