Senior Power Electronics Engineer

Senior Power Electronics 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’re seeking a Senior Power Electronics Engineer to architect and own electrical power systems that enable subsea generation, conditioning, and delivery of energy to shore. This is a foundational role. You will design power architectures from first principles, develop and release high-reliability PCBAs, and drive systems from early concept through offshore deployment. You will own everything from topology selection and magnetics design to layout, thermal management, EMI control, validation testing, and field performance.

If a converter fails at depth, you will understand why and ensure it does not fail again.

As a Senior Power Electronics Engineer, you will architect, design, and validate the power conversion and distribution systems that enable subsea energy generation and export. You will be responsible for full electrical power architecture including generator interface, AC-DC and DC-DC conversion, protection strategy, grounding and isolation philosophy, control loops, thermal management, EMI containment, and long-term reliability at depth.

You will blend deep theoretical expertise in power electronics with hands‑on experience shipping hardware. This is not a simulation‑only role. We are looking for someone who has personally selected topologies, designed magnetics, laid out high‑power PCBAs, brought up boards in the lab, debugged switching noise and instability, and driven designs through revision cycles into production. You understand the difference between a stable model and a converter operating at full load in a harsh electrical and thermal environment.

You will own the full PCBA lifecycle from architecture and schematic capture through layout review, fabrication, bring‑up, validation testing, design iteration, and field performance analysis. You will work cross‑functionally with mechanical, controls, subsea systems, and offshore operations teams to ensure our power systems are efficient, stable, fault‑tolerant, and serviceable.

• Architect and design subsea power conversion and distribution systems from generator interface through export and load integration
• Select and justify converter topologies for AC-DC, DC-DC, and DC-AC systems based on efficiency, fault tolerance, thermal constraints, and scalability
• Design high‑power PCBAs including schematic capture, magnetics design, gate drive architecture, current sensing, isolation strategy, and protection circuitry
• Own PCB layout review with specific attention to high di/dt loops, parasitic inductance, creepage and clearance, EMI containment, and thermal paths
• Mechanically collaborate on packaging, heat rejection, pressure‑tolerant enclosures, and high‑voltage isolation within subsea assemblies
• Define and implement system‑level protection philosophy including overcurrent, overvoltage, short‑circuit, ground fault detection, isolation monitoring, and coordinated fault response
• Develop fault trees and failure containment strategies to prevent single‑point electrical failures from propagating through the system
• Lead board bring‑up, lab validation, and full‑load testing including efficiency characterization, thermal validation, EMI testing, and fault injection
• Drive root cause investigations for converter instability, switching noise, insulation breakdown, component overstress, and field failures
• Own the full system lifecycle including fabrication release, vendor coordination, revision control, and production readiness
• Integrate power hardware cleanly with controls,…