Endurance Energy 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. Were 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 Neuralink Robinhood and Helion with specialized expertise in complex thermal and fluid systems.

Were seeking a talented Firmware Engineer to join our team at our headquarters in Seattle where youll help design and develop the core power cycle for our revolutionary seafloor generators.

The Role

As a Senior / Principal Firmware Engineer at Endurance youll work with our founding firmware and electrical team to own the brains of the worlds first subsea geothermal power plants. Starting from a blank sheet you will be responsible for rapidly architecting building and testing embedded systems across our platform. This position requires not only technical experience but also the flexibility creativity and entrepreneurial mindset essential to an early-stage startup.

Key Responsibilities

• Lead the embedded system design of our novel subsea geothermal power plants

• Develop early communication systems between our deployed hardware and engineers on land

• Support bring-up of the high power electrical systems your firmware integrates with

• Validate and debug your own work and the broader system

• Be hands on in the lab including supporting hardware assembly as needed

• Support deployments of test coupons prototypes and production hardware to the ocean floor

• Support business development activities including supplier meetings technical presentations and customer interactions

Qualifications

• Bachelors degree in electrical engineering computer engineering computer science mathematics or related STEM field; OR 5 years of experience in writing firmware for microcontrollers or low-level software in lieu of a degree

• 3 years of experience in embedded firmware development

• Proficiency in C/C bare-metal RTOS debugging with GDB/JTAG Python scripting for tools/tests version-control and code-review

• Strong grasp of computer architecture including memory/peripheral maps DMA and timing analysis

• Familiarity with common MCU peripherals (SPI I²C CAN Ethernet UART ADC/PWM)

• Comfort working around 800 V Megawatt-class equipment

• Familiarity with oscilloscopes logic analyzers and other common electrical lab equipment

• Willing to work hands-on and occasionally off-hours to meet mission/test windows

Preferred Skills

• Experience writing firmware for power converters motor drives high-voltage battery packs and battery chargers

• Experience creating fault-tolerant distributed or deterministic control systems with graceful degradation and watchdog recovery

• Experience implementing self-test diagnostics FDIR/FMEA redundant sensing/actuation and over-the-air update mechanisms

Benefits & Perks

• 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

• Impact-Driven Work: Help solve one of the worlds most pressing challenges - clean reliable power generation

• Competitive Compensation: Comprehensive salary and equity packages

• Benefits: Vision Dental Health insurance coverage

• Dive Certification: Company-sponsored recreational dive certification

• PTO: Unlimited (with advanced notice)

Endurance is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

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