Senior Electrical Test 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 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.

Key Responsibilities

• Own the hardware test systems for Endurance's subsea electronics end to end: requirements, architecture, design, build, bring-up, documentation, and upkeep
• 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
• 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
• Write automated test software for instrument control, data acquisition, sequencing, limit checking, and report generation
• Plan and run development, qualification, and acceptance test campaigns: functional and power tests, hipot and insulation resistance, thermal, and pressure testing in hyperbaric chambers
• Write test plans and procedures, set pass/fail criteria with the RE, execute the tests, and author test reports
• Troubleshoot failures to the component level, separate test-system faults from UUT faults, and drive root cause and corrective action
• 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
• Help define Endurance's test standards, lab infrastructure, and test-equipment supplier base

Required Qualifications

• 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 writing software for test automation

Preferred Qualifications

• 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
• Proficiency writing software in Rust or Python

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.