Senior/Principal Turbomachinery Engineer

Endurance is building the world's first modular subsea geothermal power plants, converting vast thermal resources under the ocean into gigawatts of baseload power. Backed by Founders Fund, Felicis, First Round Capital, and Point72 Ventures, our founding team includes veterans from SpaceX, Helion, Blue Origin, and Apple. We have completed multiple deep-ocean deployments to subsea volcanoes and are launching a long-term demonstration project this fall. By leveraging modular design, manufacturing scale, efficient drilling, and latent cooling on the seafloor, we are pioneering a new category of energy that outperforms traditional sources on environmental impact, deployment speed, and cost.

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.

Requirements

• Bachelor’s degree in Mechanical or Aerospace Engineering (Master’s 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.

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

• Health, Dental, and Vision insurance coverage
• Flexible PTO including 12 paid company holidays
• Travel to fascinating deployment sites along oceanic ridges in locations like the Pacific Northwest, Hawaii, Iceland, Japan, New Zealand, and the Azores
• Participate in sea trials and deployment operations in partnership with leading oceanographic institutions
• Work with technology that spans high-power electronics, marine systems, and clean energy
• Company-sponsored recreational dive certification
• Access to the company boat, free meals and snacks

Pay

Compensation Range: $175K - $275K

As a pre-revenue startup, Endurance Energy offers competitive base salaries and generous equity packages for full-time employees. Final base salary will be determined by an array of factors including internal equity, job-related knowledge, skills, and work experience. Equity is granted to every full-time employee as a meaningful piece of ownership, aligning value creation with rewards.