Senior Electrical 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 Point72 Ventures, our exceptional founding team includes veterans from SpaceX, 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. The Role 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. 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 infrastructure Qualifications 6+ years of experience designing and shipping power electronics hardware in demanding or high‑reliability environments Demonstrated experience architecting complete power systems, not just individual boards or subcircuits Deep understanding of power conversion fundamentals including topology tradeoffs, control loop stability, magnetics design, switching losses, thermal modeling, and efficiency optimization Proven experience designing high‑power PCBAs including schematic capture, layout collaboration or ownership, isolation strategy, and protection circuitry Strong working knowledge of grounding, shielding, EMI mitigation, creepage and clearance requirements, and high di/dt layout practices Experience implementing and validating protection strategies including overcurrent, overvoltage, short‑circuit, ground fault detection, and fault isolation Hands‑on lab experience bringing up high‑power hardware, debugging instability, chasing down noise and parasitics, and performing controlled fault injection Experience with high‑voltage systems or DC buses preferred, including practical understanding of insulation coordination and safety considerations Demonstrated ownership of hardware through full lifecycle including board release, fabrication, bring‑up, revision control, and production transition Ability to think from first principles and challenge legacy assumptions when appropriate High ownership mentality and comfort being the single‑threaded owner of a critical electrical system Strong cross‑disciplinary communication skills and ability to collaborate with mechanical, controls, subsea, and offshore operations teams Entrepreneurial mindset and willingness to operate in ambiguity while building a new class of energy infrastructure Benefits & Perks Hands‑on Experience: Work directly with large‑scale, cutting‑edge clean energy systems and participate in sea trials Impact‑Driven Work: Contribute to solving one of the world’s most pressing challenges—clean, reliable power generation Competitive Compensation: Competitive salary and equity compensation Benefits: Health, dental, and vision coverage PTO: Unlimited with advanced notice Endurance is an equal opportunity employer. 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