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 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 and/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

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.