Senior Propulsion Engineer (Rocket Motor Soft Goods)
About The Position
Castelion was founded to restore America’s ability to field advanced weapons at speed and scale. Inspired by the engineering urgency of the WWII and Apollo eras, we combine rapid iteration, vertical integration, and scalable manufacturing to deliver affordable, high-performance strike systems. Our mission: rebuild industrial agility to strengthen national security and outpace evolving threats. About the Role: We are seeking a Senior Propulsion Engineer to design and deliver rocket motor soft goods for Castelion's long-range hypersonic strike vehicles. This role is critical to ensuring reliable motor performance, structural integrity, and thermal protection through the design of liners, insulators, inhibitors, and related internal components. You will work hands-on with multidisciplinary engineering teams to design, analyze, build, and validate soft goods systems in a fast-paced, hardware-driven environment.
Requirements
- Bachelor's, Master's, or PhD in Aerospace Engineering, Mechanical Engineering, Materials Science, or related field
- 5+ years of experience in rocket propulsion or high-temperature material systems, with focus on soft goods or internal motor components
- Strong background in insulation materials, liners, and bonding systems used in solid rocket motors
- Experience with thermal protection materials and behavior under high heat flux and pressure environments
- Familiarity with propellant compatibility, adhesion, and chemical interactions with soft goods materials
- Experience with material processing techniques for elastomers, ablatives, or composite insulation systems
- Proficiency in analysis and modeling tools (e.g., MATLAB, ANSYS, or equivalent)
- Experience with propulsion testing, data analysis, and failure investigation
- Strong problem-solving mindset, thriving in a fast-paced, hardware-rich, high test cadence environment
Responsibilities
- Design and deliver rocket motor soft goods for Castelion's long-range hypersonic strike vehicles.
- Ensure reliable motor performance, structural integrity, and thermal protection through the design of liners, insulators, inhibitors, and related internal components.
- Work hands-on with multidisciplinary engineering teams to design, analyze, build, and validate soft goods systems in a fast-paced, hardware-driven environment.
Benefits
- Meaningful equity for all full-time employees
- Four (4) weeks of paid time off
- Ten (10) company paid holidays
- Medical: Plans at 100% employee covered and 80% of dependent coverage
- Dental & Vision: 90% employees and 80% for dependents
- FSA/HSA options
- 401k plan
- Paid Parental Leave: Birthing parents eligible for up to 10 weeks of paid leave, non-birthing parents may take up to 4 weeks of paid leave. Additional paid pregnancy leave for CA employees
- Frequently catered lunches and team meals
- Company-covered meals when extra time or effort is required
- Fully stocked kitchen with unlimited snacks and drinks
- $100 monthly fitness stipend
- Onsite electric vehicle charging
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What This Job Offers
Job Type
Full-time
Career Level
Senior
