CNC Machinist

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.

As a CNC Machinist at Castelion, you will be responsible for machining & manufacturing complex components for high performance aerospace products.

• Set up, operate, and program multi‑axis CNC mills and lathes (up to 5‑axis) to manufacture complex aerospace components
• Perform precision inspections using an array of metrology equipment to verify dimensions and ensure adherence to drawings and tolerances
• Read and interpret blueprints, CAD drawings, GD&T, and other technical documents to complete machining operations
• Manage cutting tools in CNC machines, ensuring optimal tool load and measurement for upcoming programs
• Troubleshoot and resolve operational issues, including alarm resolutions and tooling repairs, to maintain maximum machine uptime
• Operate CNC machines in a production environment, producing both development and flight hardware while meeting quick‑turn program goals
• Conduct on‑machine deburring and precision cleaning of components to ensure quality and reduce human intervention
• Maintain a clean and safe work environment, adhering to company guidelines and 5S principles
• Provide continuous feedback for process improvements and efficiency opportunities to engineering and leadership
• Actively participate in preventative maintenance of CNC machines on a weekly and monthly basis
• Communicate with shop leadership regarding production challenges and collaborate with teammates to support workflow

• High school diploma or equivalency certificate
• 5+ years of experience in CNC machining, particularly with aerospace machine shops and hard metals
• Demonstrated proficiency in G‑code, with strong setup and operational skills on CNC mills and lathes
• Ability to read and understand complex blueprints, GD&T, and tolerances

• Experience with various materials such as Inconel, titanium, stainless steel, copper, and aluminum
• 3+ years of setup experience on vertical mills
• 1+ year of experience setting up and operating 5‑axis mills
• Familiarity with CNC programming using software such as NX, Solidworks HSM, Mastercam, Fusion 360 or Esprit CAD/CAM
• Experience with multiple CNC control systems, including Heidenhain, Haas, Fanuc, Siemens, and others
• Strong mechanical aptitude and understanding of tooling technology and shop math
• Excellent interpersonal skills and the ability to contribute to a team‑oriented environment.

• 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
• 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