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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 As a Senior Electrical Engineer, you will architect, design, and validate the low-voltage control and instrumentation systems that enable subsea energy generation. You will be responsible for the full embedded electrical stack including microcontroller and embedded Linux platforms, analog sensor interfaces, battery management system integration, communication systems, wiring harness design, and fault-tolerant system architecture. You will blend broad hands-on hardware experience with the discipline to build for extreme environments. This is not a simulation-only role. We are looking for someone who has personally selected components, designed analog front ends, brought up embedded boards in the lab, debugged intermittent failures, and driven designs through revision cycles into production. You understand the difference between a board that passes validation and a system running unattended in a harsh subsea environment. You will own the full hardware 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, power/subsea systems, and offshore operations teams to ensure our control systems are robust, fault-tolerant, and built to last. KEY RESPONSIBILITIES - Architect and design low-voltage control and instrumentation systems from sensor interfaces through communication links and system supervisory logic - Select and implement microcontrollers and embedded Linux processors appropriate for subsea control applications - Design analog sensor front ends for pressure, temperature, flow, and shaft speed including signal conditioning, filtering, and ADC interfacing - Integrate battery management systems and design low-voltage power distribution for control electronics - Architect and implement communication systems including Ethernet, fiber optic, and serial protocols for subsea-to-surface data links - Produce electrical harness drawings and coordinate with manufacturing of cable assemblies, connectors, and harness fabrication - Define and implement fault-tolerant design strategies including redundancy, watchdog supervision, fault detection, and graceful degradation for non-retrievable deployments - Develop fault trees and failure containment strategies to prevent single-point failures from taking down critical monitoring or control functions - Lead board bring-up, lab validation, and system-level testing including sensor accuracy characterization, communication link validation, and fault injection - Drive root cause investigations for sensor dropouts, communication failures, firmware faults, connector failures, and field anomalies - Own the full system lifecycle including fabrication release, vendor and CM coordination, revision control, and production readiness - Integrate control hardware cleanly with power systems, firmware, mechanical enclosures, and offshore operations - Establish electrical design standards, documentation discipline, and reliability practices appropriate for subsea infrastructure QUALIFICATIONS - 6+ years of experience designing and shipping embedded or mixed-signal hardware in demanding or high-reliability environments - G