About Endurance

Endurance is building the worlds first modular subsea geothermal power plants converting vast thermal resources under the ocean into gigawatts of baseload power. Backed by First Round Capital and Point72 Ventures our founding team includes veterans from SpaceX Helion and Robinhood. We have completed multiple deep ocean deployments and are launching our generation pilot this year. By leveraging manufacturing scale efficient drilling and latent cooling on the seafloor we are pioneering a new category of energy that outperforms traditional sources on both environmental impact and cost.

What youll be doing

As Principal Turbomachinery Engineer at Endurance you will be the critical technical member of the team responsible for the core of our seafloor power plants. You will lead the design analysis and optimization of high-performance turbines and pumps specialized for compact power cycles.

This role requires a combination of strong first principles understanding of turbomachinery and a first principles hands-on approach to hardware. You will take turbomachinery designs from initial 1D sizing all the way to testing production designs in subsea deployments.

Key Responsibilities

• Lead Aero-Thermal Design: Own the design and optimization of turbines and pumps for power generation cycles.

• Rapid Iteration: Use 1D/2D modeling tools for rapid sizing trade studies and system-level integration.

• Numerical Simulation: Conduct high-fidelity 3D CFD analysis and structural FEA to ensure component performance and reliability.

• Testing & Validation: Lead test campaigns to validate turbomachinery performance correlate analytical models with experimental data and identify failure modes.

• Mechanical Integration: Integrate rotors housings bearings and seals into robust field-ready assemblies.

• Tool Development: Establish internal modeling processes design standards and documentation to enable the team to scale.

Required Qualifications

• Bachelors degree in Mechanical or Aerospace Engineering (Masters or PhD preferred).

• 3 years of experience in the design analysis and testing of high speed rotating machinery (pumps compressors or turbines).

• Strong fundamentals in thermodynamics fluid mechanics and heat transfer.

• Experience with CAD software (e.g. Siemens NX) and rapid prototyping.

• Ability to thrive in a fast-paced scrappy startup environment.

Preferred Qualifications

• Experience with turbomachinery design tools such as AxStream CFTurbo etc.

• Proficiency in CFD and numerical simulation tools (e.g. ANSYS CFX/Fluent OpenFOAM or Numeca).

• Experience with supercritical CO2 or organic Rankine cycle (ORC) turbomachinery.

• Knowledge of high-pressure seal design and rotor dynamics.

• Hands-on experience setting up and operating high-speed rotating equipment test rigs.

• Programming skills (Python MATLAB or C) for automated design optimization and data analysis.

Benefits & Perks

• Global Fieldwork: Travel to fascinating deployment sites along oceanic ridges in locations like the Pacific Northwest Hawaii Iceland Japan New Zealand and the Azores

• Hands-on Experience: Participate in sea trials and deployment operations in partnership with leading oceanographic institutions

• Cutting-edge Development: Work with technology that spans high-power electronics marine systems and clean energy

• Impactful Work: Help solve one of the worlds most pressing challenges

• Competitive Compensation: Comprehensive salary and equity packages

• Benefits: Vision Dental Health insurance coverage

• Dive Certification: Company-sponsored recreational dive certification

Required Experience:

Staff IC