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ABOUT ENDURANCE 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, and Robinhood. We have completed multiple deep-ocean deployments 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 both environmental impact and cost. WHAT YOU'LL BE DOING 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. 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. KEY RESPONSIBILITIES - 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, firmware, mechanical systems, and offshore operations - Establish electrical design standards, review rigor, documentation discipline, and reliability practices appropriate for subsea energy inf