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.

CNC Machinist – 5 Axis – 2nd Shift (230pm to 11pm)

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

Responsibilities

• 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

Basic Qualifications

• 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

Preferred Skills and Experience

• 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.

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

Physical Demands

• Must be willing to work extended hours and/or weekends as needed

• Must be able to travel up to 30%
• Must be able to lift more than 50lbs

ITAR Requirements

To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State.

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. Failure to obtain or maintain any required clearance or authorization may result in reassignment, leave, or separation from employment, consistent with business needs and applicable law.

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.

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.