Senior Manufacturing Engineer

Company: Castelion
Location: Torrance, CA or Rio Rancho, NM (in office 5 days per week)
Compensation: $160,000 - $200,000 + competitive equity
Employment Type: Full-time
Visa Sponsorship: Not available (US citizens and green card holders)

Castelion is a modern defense production company building long-range hypersonic strike systems to close a critical national security gap. Founded in 2021 under a philosophy of "peace through deterrence," it is one of the few hypersonics companies to move beyond concepts to production, with active government contracts including a $23M+ Navy order for 50 units delivering in 2027.

Castelion has raised $1B+ through its Series C.

Castelion is hiring Senior Manufacturing Engineers (5+ years) to own and scale production of critical components for long-range hypersonic strike systems. In a 0-to-1 manufacturing environment, you will drive the transition from prototype to scalable production of thousands of units a year. Castelion needs people who have built and scaled manufacturing capacity, not just sustained it.

• Own a critical subsystem or component and drive its manufacturing: defining processes, building capacity and improving reliability and efficiency.
• Develop and scale production processes for complex hardware (composites, solid rocket motors, bonding/epoxy, machined components or specialty materials).
• Turn development-stage manufacturing into production-ready assembly lines.
• Write and refine build instructions, test procedures, safety standards and mBOMs.
• Partner with design engineers on DFM and secure the resources to hit production deliverables.

• 5+ years of manufacturing engineering experience
• A record of building and scaling manufacturing capacity for complex hardware
• Experience with composites, energetics, bonding, machining or specialty materials processing
• NX, Teamcenter or similar CAD/PDM tools
• US citizenship or green card (defense work)
• Ability to work on-site 5 days a week in Torrance, CA or Rio Rancho, NM

NX, Teamcenter, CAD/PDM