Mechanical Engineer (Propulsion/Fluids)

About this role

Apex is hiring a Mechanical Engineer to design and qualify propulsion systems for commercial satellite buses. You'll own mechanical designs for thrusters, tanks, manifolds, and fluid systems from concept through flight operations, working across multidisciplinary teams in a fast-growing aerospace startup.

What you'll do

• Design and integrate propulsion hardware including thrusters, tanks, manifolds, and high-pressure lines
• Perform structural, vibration, and thermal analyses to support launch and on-orbit environments
• Create CAD models, technical drawings, and geometric tolerancing for flight hardware
• Plan and execute propulsion testing including vacuum, pressure, vibration, and thermal qualification
• Support manufacturing, assembly, integration, and troubleshoot test anomalies
• Partner with systems teams on requirements, margins, and subsystem interfaces

What they're looking for

• Mechanical design and CAD (NX preferred)
• Fluid mechanics and pressurized system design
• Structural and vibration analysis
• Propulsion systems engineering
• Technical documentation and GD&T
• Hardware testing and qualification
• Multidisciplinary team collaboration

Benefits

• Equity ownership in the company
• 100% company-paid medical, dental, and vision coverage
• $100k life insurance
• Work on cutting-edge satellite propulsion technology
• Fast-growing startup with $500M+ in funding
• Investment in employee development