Integration & Test Specialist at Endurance-energy in Seattle, WA

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 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 our generation pilot this year. By leveraging 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 an Integration & Test Specialist at Endurance Energy, you will work alongside mechanical, fluids, and electrical engineers to assemble, plumb, instrument, and test complex systems under real-world conditions. You will be responsible for taking subsystems from parts to fully integrated hardware, pressure-tight, leak-free, instrumented, and ready for test. You will play a key role in debugging integration issues, improving build processes, and ensuring systems are safe and robust before deployment. You are expected to operate with high ownership on the floor: driving build quality, identifying issues early, and pushing systems to readiness without waiting for direction. This is a critical position where your speed, precision, and judgment directly impact our ability to hit hardware milestones on aggressive timelines. KEY RESPONSIBILITIES - Assemble mechanical and fluid systems including pressure vessels, piping, valves, and heat exchangers - Perform tubing and piping integration including routing, bending, cutting, and fitting - Execute high-quality plumbing of test systems and subsea hardware (Swagelok, compression fittings, welded systems, etc.) - Install sensors, instrumentation, and support hardware for test readiness - Perform pressure testing, leak checking, and system validation (hydrostatic and pneumatic) - Support system bring-up and debugging alongside engineering teams - Read and interpret engineering drawings, P&IDs, and assembly documentation - Identify and resolve fit-up, tolerance, and integration issues in real time - Drive clean, organized, and repeatable build processes on the floor - Document builds, test setups, and issues for engineering and QA traceability - Support rapid prototyping and iteration under tight timelines - Maintain a safe working environment when operating high-pressure and high-temperature systems QUALIFICATIONS - 5+ years of hands-on experience in mechanical assembly, fluid systems, or integration roles - Demonstrated experience assembling and testing complex mechanical or fluid systems - Strong experience with tubing, piping, fittings, and fluid system integration - Ability to read and interpret mechanical drawings and P&IDs - Experience with pressure testing, leak detection, and system validation - Strong mechanical intuition and ability to troubleshoot integration issues quickly - High attention to detail and craftsmanship in assembly work - Track record of working effectively in fast-paced, prototype-driven environments - High ownership mindset and ability to operate independently with minimal supervision - Strong communication skills and ability to work closely with engineers PREFERRED SKILLS - Experience with orbital tube welding or other high-reliability welding processes - Background in high-pressure systems, process piping, or thermal systems - Experience in marine, subsea, aerospace, or energy hardware environments - Familiarity with Swagelok or equivalent fluid system standards and best practices - Light fabrication and manual machining experience (lathe, mill, drill press) - Experience supporting test operations and building custom test infrastructure - Familiarity with cleanliness standards and contamination control for fluid systems - Ability to contribute to fixture design and integration tooling 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 - Impactful Work: Help solve one of the world's most pressing challenges - Competitive Compensation: Comprehensive salary and equity packages - Benefits: Vision, Dental, Health insurance coverage - Dive Certification: Company-sponsored recreational dive certification