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Job description
Rio Rancho, United States | Posted on 08/06/2026
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, build, and test rocket motor systems for Castelion's long-range hypersonic strike vehicles. This role is critical to delivering reliable, high-performance propulsion across all mission phases. You will work hands-on with multidisciplinary engineering teams to develop solid rocket motors and associated hardware from concept through flight test in a fast-paced, hardware-driven environment.
Requirements
Bachelor's, Master's, or PhD in Aerospace Engineering, Mechanical Engineering, or related field
5+ years of experience in rocket propulsion design, analysis, and testing for aerospace or defense applications
Strong background in solid rocket motor design, including internal ballistics, grain design, and nozzle performance
Experience with propulsion testing, including static fire test setup, instrumentation, and data analysis
Familiarity with structural and thermal design considerations for high-temperature, high-pressure systems
Proficiency in analysis and modeling tools (e.g., MATLAB, ANSYS, or equivalent)
Experience with hardware build, integration, and troubleshooting in a lab or test environment
Strong problem-solving mindset, thriving in a fast-paced, hardware-rich, high test cadence environment
Employee Equity: Meaningful equity forall full-time employees - share value has increased 150x in three years
Personal Time Off: Four (4) weeks of paidtime off to unplug, reset, and come back sharp—velocity matters,burnout doesn't
Medical: We offer plans at 100% employeecovered and 80% of dependent coverage
Dental & Vision: We cover 90%employees and 80% for dependents to ensure you and your family haveaccess to quality preventive and ongoing care
FSA/HSA: To support long-term health andfinancial resilience, we offer FSA and HSA options that allowemployees to set aside pre-tax dollars for eligible medical anddependent care expenses
Retirement: 401k plan offered to supportlong term financial growth along side high-impact, high-velocity work
Paid Parental Leave: We support growingfamilies with meaningful time to bond and recover. Birthing parentsare eligible for up to 10 weeks of paid leave, while non-birthingparents may take up to 4 weeks of paid leave. This time can be usedfor pre-natal care, pregnancy, childbirth, and related medicalneeds—ensuring every parent has the support they need during thisimportant life moment.8-weeks of paid parental leave for allparents. Additional paid pregnancy leave for CA employees
Meals & Catering: Frequently cateredlunches and team meals, plus company-covered meals when extra timeor effort is required
Snacks & Beverages: Fully stockedkitchen with unlimited snacks and drinks to keep you fueledthroughout the day
Performance & Fitness: $100 monthlyfitness stipend to support peak performance and health, both insideand outside of work
EV Charging: Onsite electric vehiclecharging available for employees
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Worksite address
rio rancho, NM, 87144, US
Who can apply
Review the original listing for work authorization, qualifications and employer requirements.