Senior Principal Software Engineer Jobs in Renton, 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 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/Principal Software Engineer at Endurance, you will build software to optimize and accelerate every aspect of the company. As we scale from our first hundred-kilowatt subsea demonstration to gigawatt deployments, you will architect, configure, and build the internal systems to run the hydrothermal power plant, the testing software, the cloud infrastructure, and the tooling for all engineers at the company.
We believe an internal software team building the right stack is one of the highest leverage moves we can make as we scale.
You will be in the room with the hardware engineers designing subsea power plants, the manufacturing leads building the production system, the supply chain leads structuring procurement, and the operators running ocean deployments, designing and delivering the software that makes their work faster, safer, and more scalable. In the near term, that means standing up the data and telemetry pipeline for our first subsea demonstration, building out our cloud services, scoping and selecting the foundational engineering and manufacturing systems, designing the supply chain and procurement tooling that will support our first 10MW commercial deployments, and prototyping the first generation of Endurance's internal tools.
You will also build the production software that makes a power plant on the seafloor operable. You will design the data pipeline that streams from a turbine kilometers below the surface, the dashboards that let a Seattle control room run a plant off Tonga, and the operational software that turns a fleet of subsea power plants into a utility.
The ideal candidate is a senior or staff engineer who has strong judgment on when to buy a vendor product and when to write your own, can hold technical credibility with mechanical, electrical, and systems engineers, and is energized by building the software that operates a category of energy infrastructure that has never existed before.
You will be one of the first full-stack software engineer at the company. You will work directly with the founding team and the operational leaders across Endurance, and as the software function grows, you will have significant influence on what gets built, who joins the team, and how the organization is shaped.
Key Responsibilities
Architect and build the telemetry, data, and operational software that runs Endurance's power plants on the seafloor and supports subsea deployment operations
Make and execute the build, buy, and configure calls on standing up software for procurement, hardware engineering, telemetry, and operational tooling software
Interface closely with internal customers to understand their workflows, inefficiencies, and needs - so you can create great software to accelerate them
Write production code, set engineering standards, and build the technical patterns that the broader software team will inherit
Partner with engineering, manufacturing, supply chain, finance, and policy leaders to ensure the software roadmap maps to operational reality
Establish cybersecurity, data governance, and development practices appropriate for a venture-backed company operating across federal, defense, and international markets
Own the technical foundation that the broader software organization is built on
Help shape the software organization as it grows, including interviewing and onboarding future engineers
Qualifications
5+ years of software engineering experience
Track record architecting, shipping, and operating internal software systems
Demonstrated ability to ship production software end to end, from architecture through deployment and operation
Technical fluency strong enough to hold credibility with mechanical, electrical, and systems engineers
Comfort being an early software engineer at a venture-backed company at sub-fifty headcount, including all the ambiguity that comes with it
Ability to work onsite in Seattle and travel to deployment sites as required
Preferred Skills
Experience at all levels of the software stack -- from microcontrollers to cloud computing.
Familiarity with Rust and Nix.
Experience with manufacturing execution systems, supplier development tooling, or quality data systems at scale
Familiarity with cybersecurity frameworks relevant to defense and federal contracting (CMMC, NIST 800-171, FedRAMP)
Prior experience standing up software for ITAR / EAR controlled environments
Background in subsea, aerospace, defense, or other regulated hardware industries
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