Senior/Principal Mechanical Engineer (Valves & Components)

The role

You will design, build, test, and deploy fluid components for modular subsea geothermal power plants. This includes valves, seals, fittings, and manifolds that operate in high-temperature, high-pressure underwater environments.

What you will do

• Own specific fluid components from requirements through design, qualification, and field performance
• Design valves and sealing systems for 250-350 °C fluid with 100-300 bar external pressure
• Select and qualify materials for hot chloride, sulfide, and silica-scaling environments
• Perform first-principles flow, thermal, and structural analysis
• Design and build hot-fluid test rigs
• Run pressure, endurance, leak, thermal-cycling, and corrosion tests
• Lead root-cause investigations on test and field hardware
• Define interfaces with actuators and pressure boundaries
• Work with machine shops and specialty suppliers on tight-tolerance parts
• Create detailed 3D CAD models, drawings, and tolerance stacks

Required qualifications

• Bachelor's degree in mechanical engineering, aerospace engineering, or a related engineering discipline
• 6+ years of professional experience designing, testing, or manufacturing fluid-control hardware for demanding environments
• Ownership of at least one fluid component from concept through qualification and fielded use

Nice to have

• Experience designing propulsion valves or flow-control devices for rocket engines or feed systems
• Equivalent depth in subsea oil & gas components, high-temperature steam or geothermal hardware, or nuclear-grade pressure-boundary components
• Strong understanding of seal and seat design, leakage physics, and seal behavior across large temperature ranges
• Strong fundamentals in solid mechanics, fluid dynamics, heat transfer, and materials
• Experience designing and running qualification and acceptance tests and analyzing the results
• Hands-on experience with GD&T, design for manufacture in hard-to-machine alloys, and time in a machine shop and test cell
• Experience at a small or fast-moving hardware organization
• A track record of taking on increasing responsibility and delivering something difficult early in your career
• Experience on an engineering competition team or an equivalent self-directed hardware project

Benefits

• Health, Dental, and Vision insurance coverage
• Flexible PTO including 12 paid company holidays
• Travel to deployment sites along oceanic ridges
• Participate in sea trials and deployment operations
• Company-sponsored recreational dive certification
• Access to the company boat
• Free meals and snacks

About the company

Endurance is building the world's first modular subsea geothermal power plants, converting vast thermal resources under the ocean into gigawatts of baseload power.