Senior Electrical Test Engineer

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.

As a Senior Electrical Test Engineer at Endurance, you will own the test systems for our subsea electronics: the racks, fixtures, interface harnesses, automation software, and procedures we use to develop, qualify, and accept every subsea electrical system we build.

This is a design-ownership role. You will partner with subsystem design engineers, reviewing ICDs, requirements, and designs to determine the best approach to validating them across an array of environmental conditions, including temperature, extreme pressure, and accelerated stress testing.

Once deployed, our hardware cannot be serviced. The tests you design and execute are the best chance we have to find problems while they are still easy to fix. Your judgment about what to test, and how rigorously, will directly determine whether our systems run reliably on the seafloor.

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  Own the hardware test systems for Endurance's subsea electronics end to end: requirements, architecture, design, build, bring-up, documentation, and upkeep

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  Work with each subsystem's electrical RE from the start of development, derive test requirements from their design and interface documents, and provide design-for-test feedback

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  Design and build test racks, unit-under-test (UUT) fixtures, and interface and breakout harnesses that connect UUTs to power, loads, instrumentation, and data acquisition, including through pressure-vessel bulkheads and penetrators

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  Write automated test software for instrument control, data acquisition, sequencing, limit checking, and report generation

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  Plan and run development, qualification, and acceptance test campaigns: functional and power tests, hipot and insulation resistance, thermal, and pressure testing in hyperbaric chambers

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  Write test plans and procedures, set pass/fail criteria with the RE, execute the tests, and author test reports

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  Troubleshoot failures to the component level, separate test-system faults from UUT faults, and drive root cause and corrective action

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  Build test capability that scales from one-off development units to production acceptance test of commercial systems, improving coverage, cycle time, and operator usability as we grow

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  Help define Endurance's test standards, lab infrastructure, and test-equipment supplier base

• Bachelor's degree in electrical engineering or a related STEM discipline

• 3+ years of experience in hardware or electronics test engineering, instrumentation, or data acquisition system design for complex hardware

• Hands-on experience designing, building, and bringing up electronics test systems: racks, fixtures, interface harnesses, DAQ, power supplies, and electronic loads

• Fluency with electrical lab equipment, including oscilloscopes, DMMs, programmable power supplies, electronic loads, and source measure units

• Working knowledge of common hardware interfaces: CAN, RS-422/485, Ethernet, SPI, I2C, and analog signal conditioning and conversion

• Ability to read schematics and debug electronics at the board and component level

• Experience writing test plans, procedures, and reports, and defining pass/fail criteria with design engineers

• Strong communication skills and the ability to work closely with electrical engineers, mechanical engineers, and technicians

• Comfortable in a fast-paced, prototype-driven environment where designs evolve rapidly, including extended hours during critical test campaigns

• Ability to work onsite in Seattle and travel to deployment sites as required

• Experience testing hardware for subsea, marine, aerospace, or defense systems

• Experience with environmental qualification testing: pressure/hyperbaric, thermal, vibration, and shock

• Experience with high-voltage and high-power electronics test, including safety interlocks, hipot, and insulation resistance

• Experience with hardware-in-the-loop (HIL) test and simulation of subsystem interfaces

• Experience with PLCs or industrial control hardware for test-cell automation and safety

• Understanding of metrology, measurement uncertainty, and calibration practice