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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, and Robinhood. We have completed multiple deep-ocean deployments 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 both environmental impact 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, relia