Senior Electromechanical Engineer

Senior Electromechanical Engineer | Seattle, WA

Endurance is developing modular seafloor geothermal power plants that harness the vast thermal energy beneath the ocean floor to provide gigawatts of clean, reliable energy. We're addressing the critical power bottleneck facing AI infrastructure development while creating a path toward energy independence and decarbonization across the globe.

Backed by premier venture capital firms including First Round Capital and Point
72 Ventures, our exceptional founding team includes veterans from Space

X, Robinhood, Helion, and Neuralink, with specialized expertise in complex thermal and fluid systems and business development.

We are seeking a Senior Electromechanical Engineer to own the systems that live at the boundary between electrical and mechanical engineering. This is a foundational role. You will take ambiguous, high-risk electromechanical assemblies such as power generation modules, subsea connectors, pressure-balanced enclosures, high-current paths, and thermal interfaces, and drive them from first principles to offshore deployment. You will eliminate the gray zones between disciplines by personally architecting, mechanically designing, releasing, building, testing, breaking, and hardening hardware that must survive saltwater, pressure, vibration, and time.

You will move at blistering pace, close loops aggressively, and take full accountability for system reliability in the field. If something fails on the seafloor, you will feel responsible and you will fix it permanently.

As a Senior Electromechanical Engineer, you will design, integrate, and harden the critical electromechanical systems that enable our seafloor power plants to operate reliably  will be responsible for full system architecture across electrical and mechanical boundaries including power generation modules, grounding and current paths, subsea connectors and penetrators, sealing strategies, pressure compensation, thermal interfaces, and long-term environmental integrity.

You will blend rigorous theoretical understanding of electrical and mechanical fundamentals with deep hands-on experience shipping hardware in harsh environments. This is not a desk-only role. We are looking for someone who has personally built assemblies, debugged failures in the lab or in the field, chased down leakage currents and soft shorts, and understands the difference between a clean schematic and a system soaked in saltwater.

You will work cross-functionally with drilling, subsea systems, power cycle, and operations teams to ensure our machines generate and deliver power reliably without hidden failure modes at discipline boundaries.

• Architect and design mission-critical electromechanical systems from concept through offshore deployment
• Define integrated electrical and mechanical system architecture including current paths, grounding topology, sealing strategy, pressure compensation, and thermal management
• Design and validate power generation and distribution assemblies including bus structures, connectors, penetrators, harnessing, and power conditioning interfaces
• Mechanically design and release critical components and assemblies including enclosures, connector retention systems, structural current paths, thermal interfaces, and pressure-tolerant hardware
• Eliminate ambiguity at electrical and mechanical boundaries by clearly defining ownership, interface requirements, and failure containment strategies
• Lead design reviews for high-current paths, insulation systems, and environmental protection schemes
• Serve as technical owner for subsea electromechanical assemblies, working directly with vendors to define requirements, review designs, and drive reliability improvements
• Contribute to enclosure, connector, and pressure-tolerant system architecture to ensure long-term survivability in saltwater and high-pressure environments
• Build and execute rigorous validation plans including pressure testing, insulation resistance testing, hipot testing, thermal cycling, and accelerated life testing
• Lead root cause investigations for field failures including leakage currents, soft shorts, connector…