Machine Maintenance Lead

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.

Machine Maintenance Lead

Machine Maintenance Lead on the Facilities team at Castelion is responsible for ensuring the reliability, performance, and up time of critical manufacturing and facility equipment. In this role, you will lead hands-on maintenance, troubleshooting, and continuous improvement efforts across CNC machines and facility systems to support uninterrupted production and rapid iteration. This position offers the opportunity to work on advanced manufacturing equipment in a fast-paced, high-impact environment, making a direct contribution to Castelion's mission of rapidly developing and delivering next-generation defense capabilities.

Responsibilities

• Perform preventive and corrective maintenance on CNC machines (Doosan, SMX, TRAK), manual lathes, and general machine shop equipment.
• Maintain and repair facility machinery, forklifts, and building systems, including electrical, mechanical, pneumatic, and hydraulic components.
• Troubleshoot and resolve issues across CNC controls, mechanical systems, electrical systems, and PLCs.
• Support installation, commissioning, relocation, and upgrades of new and existing equipment.
• Partner with machinists, engineers, and production teams to quickly diagnose and resolve equipment issues in a high-mix, low-volume R&D/production environment.
• Maintain maintenance logs, downtime tracking, and parts usage in internal systems.
• Manage inventory of critical spare parts, tooling components, and maintenance supplies.
• Identify and drive continuous improvement efforts to increase uptime, reduce recurring failures, and optimize maintenance processes.

Basic Qualifications

• Read and interpret schematics, electrical diagrams, machine manuals, and technical drawings.
• High school diploma or GED required.
• 2+ years of experience maintaining and troubleshooting CNC machines and/or manufacturing equipment.
• Hands-on experience with Doosan, SMX, TRAK machines, and manual lathe equipment strongly preferred.
• Strong mechanical, electrical, and troubleshooting skills.
• Comfortable working independently in a fast-paced startup and R&D/production environment with shifting priorities.

Preferred Skills and Experience

• Experience in defense, aerospace, or regulated manufacturing environments is a plus.
• Familiarity with safety standards, lockout/tagout (LOTO), and general OSHA practices.
• Experience supporting high-mix, low-volume production or R&D environments with frequent changeovers.

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.

Benefits And Perks

All full-time employees are granted meaningful long-term equity, sharing in the company's significant growth trajectory. We offer four (4) weeks of paid time off, ten (10) company-paid holidays, and comprehensive health benefits - including 100% employee-covered medical and strong dependent coverage, along with dental and vision plans. We also provide paid parental leave to support growing families, a $100 monthly fitness stipend to promote health and performance, and onsite EV charging for convenience. In addition, employees enjoy perks like catered meals, company-covered food during high-demand periods, and a fully stocked kitchen to stay fueled throughout the day.

While this position does not currently require a U.S government-issued security clearance, it may in the near future. Therefore, the ability to obtain and maintain a U.S. government–issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Affirmative Action/EEO Statement

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.