Senior Electrical Engineer

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, Blue Origin, and Apple. We have completed multiple deep-ocean deployments to subsea volcanoes 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 environmental impact, deployment speed, 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 - Generalist hardware instincts — comfortable across microcontrollers, analog signal chains, low-voltage power, and digital communications - Demonstrated experience architecting complete embedded systems, not just individual boards or subcircuits - Hands-on experience designing analog sensor front ends including signal conditioning, filtering, and precision measurement - Working knowledge of communication protocols and physical layers including Ethernet, fiber optic, RS-485, CAN, and SPI/I2C - Experience with battery management systems or low-voltage DC power distribution for electronics - Ability to produce harness drawings and work directly with CM or contract manufacturers on cable and connector selection - Hands-on lab experience bringing up embedded hardware, debugging with oscilloscopes and analyzers, and iterating through revision cycles - Experience designing for harsh environments — thermal, mechanical, or corrosion constraints — with appropriate material and connector selection - Ability to think from first principles and make sound engineering tradeoffs under schedule pressure - High ownership mentality and comfort being the single-threaded owner of a critical embedded system - Strong cross-disciplinary communication skills and ability to collaborate with mechanical, power systems, subsea, and offshore operations teams - Entrepreneurial mindset and willingness to operate in ambiguity while building a new class of energy infrastructure PREFERRED EXPERIENCE - Prior subsea, marine, or offshore hardware experience - Background in aerospace, robotics, or medical device hardware development COMPENSATION, BENEFITS, & PERKS As a pre-revenue startup, Endurance Energy offers competitive base salaries and generous equity packages for full-time employees. Final base salary will be determined by an array of factors including internal equity, job-related knowledge, skills, and work experience. A key aspect of our compensation philosophy is that value creation should be aligned with rewards. Right now this means equity is a significant portion of every full-time employee's compensation. As the company matures, there will be continued evolution and changes to the total rewards and total compensation package. What will always be true is that if we win, we win together. Equity is granted to every full-time employee as a meaningful piece of ownership. We believe the people building the company should share directly in the value they create. In addition to a competitive base salary and equity, employees will receive all of our other great benefits and perks, including: - Benefits: Health, Dental, and Vision insurance coverage - Time Away: Flexible PTO including 12 paid company holidays - Global Fieldwork: Travel to fascinating deployment sites along oceanic ridges in locations like the Pacific Northwest, Hawaii, Iceland, Japan, New Zealand, and the Azores - Hands-on Experience: Participate in sea trials and deployment operations in partnership with leading oceanographic institutions - Cutting-edge Development: Work with technology that spans high-power electronics, marine systems, and clean energy - Impactful Work: Help solve one of the world's most pressing challenges - Dive Certification: Company-sponsored recreational dive certification - Other Perks: Access to the company boat, free meals and snacks, and the list goes on! If you’re selected for consideration, a recruiter will be able to discuss in greater detail.