Machining Apprentice, Additive ManufacturingNo locationNo departmentOn-Site View Details

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 Machine Shop Apprentice supports daily machine shop operations by maintaining a clean, organized, and efficient work environment. This role assists machinists, programmers, and manufacturing personnel with machine maintenance, material preparation, secondary operations, and general shop support activities. The position also includes operation of support equipment such as 3D printers, waterjets, and saws.

• Maintain shop cleanliness and organization in accordance with 5S standards.
• Clean CNC machines, workstations, and common areas.
• Fill and monitor machine oils, coolant, and other consumables as directed.
• Empty chip bins and assist with routine housekeeping activities.
• Organize tools, fixtures, raw materials, and shop supplies.
• Support inventory management and material handling activities.

• Assist machinists with machine setups and changeovers.
• Load and unload raw materials and finished parts.
• Deburr, clean, inspect, and package machined components.
• Transport materials, tools, and fixtures between departments.
• Assist with basic quality checks and documentation as directed.
• Support production activities to help meet delivery schedules.

• Operate and maintain 3D printers, including material loading, print setup, and part removal.
• Operate waterjet cutting equipment following established work instructions.
• Operate band saws and other cutting equipment to prepare raw materials.
• Perform basic preventive maintenance on assigned equipment.
• Report equipment issues, maintenance needs, or safety concerns promptly.

• Follow all company safety policies and procedures.
• Maintain a safe and organized work environment.
• Assist manufacturing, engineering, and machine shop personnel as needed.
• Participate in continuous improvement and efficiency initiatives.
• Perform other duties as assigned.

• High school diploma or equivalent.
• Mechanical aptitude and willingness to learn manufacturing processes.
• Ability to use basic hand tools and measuring devices.
• Ability to follow written and verbal instructions.
• Strong attention to detail and organizational skills.
• Ability to lift up to 50 lbs and stand for extended periods.

• Previous experience in a machine shop or manufacturing environment.
• Experience operating saws, waterjets, CNC equipment, or 3D printers.
• Familiarity with shop safety practices and 5S principles.
• Forklift certification (or ability to obtain certification).

• 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…