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 Integration & Test Engineer at Endurance Energy, you will own the planning and execution of complex integration and test campaigns for some of the most extreme energy hardware ever deployed. You will work across mechanical, electrical, firmware, fluids, offshore operations, and manufacturing teams to bring first-of-a-kind systems from concept to validated hardware. This role combines the responsibilities of integration engineering, test engineering, manufacturing engineering, reliability engineering, and technical program execution. You will not simply support testing — you will define how systems are integrated, verified, instrumented, operated, and matured into reliable field hardware. You will be responsible for developing test architectures, designing integration and test tooling, operating hazardous test systems, debugging failures, and driving corrective actions to closure. You will lead hardware through integration, qualification, environmental testing, deployment readiness, and field operations. You are expected to operate with extreme ownership and technical judgment. This includes identifying system-level risks before they become failures, driving standardization and operational rigor, and rapidly resolving issues under aggressive schedules. This is a highly hands-on role. You will spend substantial time on the floor, in the lab, at test sites, and in the field working directly with hardware. Key Responsibilities • Own integration and test campaigns for complex mechanical, electrical, fluid, and subsea systems from initial bring-up through deployment readiness • Develop and execute test strategies, procedures, acceptance criteria, and operational plans for development, qualification, and field testing • Design and build test infrastructure including fluid systems, pressure systems, electrical harnessing, instrumentation, DAQ setups, fixtures, and integration tooling • Lead hazardous test operations involving high pressure, high voltage, rotating machinery, thermal systems, and offshore hardware • Drive system integration across multidisciplinary hardware including mechanical assemblies, fluid systems, controls, instrumentation, and power systems • Debug complex hardware failures and lead root cause investigations across mechanical, electrical, software, controls, and operational domains • Develop instrumentation plans and configure sensors, DAQ systems, telemetry, and automated test setups • Drive reliability improvements through failure analysis, operational feedback, test data review, and process standardization • Define and improve integration workflows, test processes, build standards, checklists, and operational readiness reviews • Work closely with responsible engineers to ensure designs are testable, manufacturable, serviceable, and operationally robust • Support field deployments, offshore operations, commissioning activities, and recovery operations • Operate with urgency and technical rigor to close issues quickly while maintaining safety and hardware quality • Maintain clear documentation of procedures, test configurations, anomalies, corrective actions, and lessons learned Qualifications • 7+ years of experience in integration, test, manufacturing, reliability, or systems engineering roles involving complex hardware systems • Demonstrated experience leading integration and test efforts for multidisciplinary hardware programs • Strong hands-on experience with mechanical systems, fluid systems, instrumentation, electrical integration, or electromechanical hardware • Experience planning and executing hazardous testing involving pressure systems, thermal systems, power systems, rotating machinery, or equivalent high-energy hardware • Strong troubleshooting skills across hardware, controls, instrumentation, and system interactions • Experience designing and building test infrastructure, tooling, fixtures, or automated test systems • Ability to read and interpret engineering drawings, schematics, P&IDs, wiring diagrams, and assembly documentation • Strong systems-level thinking and ability to identify operational and reliability risks early • High ownership mindset with the ability to independently drive complex technical efforts under aggressive timelines • Excellent communication skills and ability to coordinate across engineering, operations, manufacturing, and field teams • Willingness to travel and support offshore and remote field operations as needed Preferred Skills • Experience in aerospace, subsea, marine, energy, launch vehicle, or other high-performance hardware environments • Experience operating or developing high-pressure fluid systems, thermal systems, turbomachinery, or power generation equipment • Familiarity with DAQ systems, controls integration, telemetry, and automated testing • Experience with environmental testing, vibration testing, thermal testing, or qualification campaigns • Experience with root cause analysis methodologies and reliability engineering practices • Background in manufacturing engineering or production test operations • Experience designing custom fixtures, integration tooling, or ground support equipment • Hands-on fabrication experience including machining, welding, tube bending, or structural assembly • Experience supporting offshore operations, vessel-based testing, or remote field deployments • Familiarity with high-reliability fluid system standards and practices including Swagelok or equivalent systems • Experience operating in fast-paced prototype development environments with minimal process overhead 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.