Senior Mechanical Design Engineer (ACS Systems)

STEM Boomerang • Rio Rancho, NM

4d

About The Position

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

Responsibilities

• Design and deliver attitude control system (ACS) hardware for Castelion's long-range hypersonic strike vehicles.
• Enable reliable propellant storage, flow control, and thrust generation for precise vehicle control.
• 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.

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 coverage: 90% employees and 80% for dependents
• FSA and HSA options
• 401k plan
• Paid Parental Leave: up to 10 weeks for birthing parents, up to 4 weeks for non-birthing parents
• 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

What This Job Offers

• Job Type: Full-time
• Career Level: Senior