Senior Harness 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 Harness Engineer at Endurance, you will own the design and implementation of our subsea hardware’s power, data, and signal interconnections.

This is a design-ownership role. You will take schematics and interface documents from our engineers and turn them into complete harness designs: connector and cable selection, shielding and grounding strategy, routing and strain relief, overmold and penetrator approach, termination specifications, drawings, and BOMs. You will decide what we build in-house and what we send out, and you will qualify and manage the outside harness shops, connector vendors, and molders we rely on.

Harness failures are among the most common causes of lost subsea hardware. Your judgment and execution will have a substantial impact on the success of our deployments.

Key Responsibilities

• Own harness design for subsea deployment and test systems, from interface definition through released drawings
• Participate in and own technical trades that will balance stakeholder objectives and drive system architecture, including how and whether subsystems are physically partitioned
• Produce harness drawings, physical layouts in CAD, BOMs, and termination specifications
• Define the manufacturing plan for each harness: what is built in-house, what goes to partners, the tooling required, and the build sequence
• Help identify and qualify external harness manufacturers, connector and cable suppliers, and overmolding partners
• Define acceptance test requirements for continuity, hipot, insulation resistance, and pressure, and review results with the build team
• Partner with our production team on DFM, assembly tooling, and work instructions, and incorporate build feedback into designs
• Troubleshoot harness and interconnect faults on test systems and deployed hardware, and drive root cause and corrective action
• Help shape harness standards and the supplier base as Endurance scales from demonstration to commercial systems
• Investigate new technologies and approaches to solve our unique requirements
• Required Qualifications
• 3+ years of engineering experience designing and delivering wiring harnesses or electrical interconnect for complex hardware systems
• Strong understanding of connectors, cable construction, shielding, grounding, and signal integrity, and of how harnesses fail in the field
• Experience producing harness drawings, BOMs, termination specifications, and 3D layouts in CAD (e.g., Siemens NX)
• Working knowledge of harness test methods including hipot, insulation resistance, and continuity testing
• Hands-on experience building and terminating prototypes
• Ability to perform basic PCBA or component level electrical measurements and debugging
• Strong communication skills and ability to work closely with technicians, mechanical engineers, and electrical engineers
• Comfortable in a fast-paced, prototype-driven environment where designs evolve rapidly
• Ability to work onsite in Seattle and travel to deployment sites as required

Preferred Qualifications

• Experience designing harnesses for marine, subsea, aerospace, or defense systems
• Experience with wet-mate and dry-mate subsea connectors, penetrators, overmolding, and PBOF systems
• Experience pressure-testing or qualifying subsea assemblies
• Experience debugging electrical systems and circuit boards
• Experience qualifying and managing harness manufacturers or connector suppliers
• Certification in or knowledge of IPC/WHMA-A-620 and related assembly and inspection standards