About the Role:
We are seeking a Senior Mechanical Design Engineer to design and deliver attitude control system (ACS) hardware for Castelion's long-range hypersonic strike vehicles. This role is critical to enabling reliable propellant storage, flow control, and thrust generation for precise vehicle control. You will work hands-on with multidisciplinary engineering teams to design, analyze, build, and validate ACS tanks, valves, thrusters, and integrated assemblies in a fast-paced, hardware-driven environment.
Requirements
- Bachelor's, Master's, or PhD in Mechanical Engineering or related field
- 5+ years of experience in mechanical design for aerospace or high-performance fluid/propulsion systems
- Strong background in pressure vessel design, fluid systems, and high-pressure component integration
- Experience designing tanks, valves, thrusters, or similar propulsion or ACS hardware
- Familiarity with sealing methods, leak detection, and cleanliness requirements for high-reliability fluid systems
- Proficiency in CAD and analysis tools (e.g., NX, SolidWorks, ANSYS, or equivalent)
- Experience with structural analysis, thermal analysis, and tolerance stack-up analysis
- Familiarity with high-temperature materials and operation in extreme environments
- Experience with hardware build, test, and troubleshooting in a lab or flight hardware environment
- Strong problem-solving mindset, thriving in a fast-paced, hardware-rich, high flight cadence environment
Benefits
- 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