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. Sr. Production Supervisor – Tooling Fab Castelion is seeking a world-class tooling fabrication professional to lead a team of highly skilled Technicians and be the focal point between engineering and manufacturing teams. The core focus of this role will be fabrication of tooling and large-scale ground support equipment for our long range, precision strike missile systems. This is a frontline production leader role blending hands on technical leadership with collaborative operations responsibilities. We are looking for a candidate with a history of executing in ambiguous fast paced aerospace hardware manufacturing environments to deliver high quality products within stringent timelines. Responsibilities • Supervise shop floor activity, including daily schedules and workflow. • Lead and manage a staff of up to 10 technicians, including performance management. • Hire and develop the team based on output and skillset requirements. • Maintain tooling and consumable inventory. • Identify and develop training as required from the skills matrix . • Track and execute on deliverables out of the Tooling Fabrication shop. • Develop the fabrication shop in terms of space, equipment and layout. • Develop and maintain a safe working environment. Basic Qualifications • High School Diploma • 3+ years of leadership experience in aerospace manufacturing environment Preferred Skills and Experience • 8+ years in an aerospace manufacturing environment with specific focus on tooling and GSE fabrication preferred. • Bachelors degree in an associated field. • 3+ years in a supervisory or lead technician role. • Intimate knowledge of MES software. • Excellent communication and organizational skills. Benefits And Perks • Employee Equity: Meaningful equity for all full-time employees - share value has increased 150x in three years • Personal Time Off: Four (4) weeks of paid time off to unplug, reset, and come back sharp—velocity matters, burnout doesn't • Company Paid Holidays: Ten (10) company paid holidays • Medical: We offer plans at 100% employee covered and 80% of dependent coverage • Dental & Vision: We cover 90% employees and 80% for dependents to ensure you and your family have access to quality preventive and ongoing care • FSA/HSA: To support long-term health and financial resilience, we offer FSA and HSA options that allow employees to set aside pre-tax dollars for eligible medical and dependent care expenses • Retirement: 401k plan offered to support long term financial growth along side high-impact, high-velocity work • Paid Parental Leave: We support growing families with meaningful time to bond and recover. Birthing parents are eligible for up to 10 weeks of paid leave, while non-birthing parents may take up to 4 weeks of paid leave. This time can be used for pre-natal care, pregnancy, childbirth, and related medical needs—ensuring every parent has the support they need during this important life moment.8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees • Meals & Catering: Frequently catered lunches and team meals, plus company-covered meals when extra time or effort is required • Snacks & Beverages: Fully stocked kitchen with unlimited snacks and drinks to keep you fueled throughout the day • Performance & Fitness: $100 monthly fitness stipend to support peak performance and health, both inside and outside of work • EV Charging: Onsite electric vehicle charging available for employees