Senior Test Engineer

Full Timesenior

Everett, WAPosted February 5, 2026

Job Description

About Helion

We are a fusion power company based in Everett, WA, with the mission to build the world's first fusion power plant, enabling a future with unlimited clean electricity. Our vision is a world with clean, reliable, and affordable energy for everyone.

Since Helion's founding in 2013, we have raised over $1 billion from long-time investors such as Sam Altman, Mithril, and Capricorn Investment Group as well as new investors SoftBank and Lightspeed to propel us forward. Our last prototype, Trenta, completed 10,000 high-power pulses and reached plasma temperatures of 100 million degrees Celsius (9 keV). We are now operating Polaris, our next prototype on the path to the world's first fusion power plant.

This is a pivotal time to join Helion. You will tackle real-world challenges with a team that prizes urgency, rigor, ownership, and a commitment to delivering hard truths – values essential to achieving what no one has before. Together, we will change the future of energy, because the world can't wait.

What You Will Be Doing:

You will develop, optimize, and maintain automated test systems that validate Helion's power electronics, PCBAs, and high-voltage assemblies. Acting as the technical bridge between design engineering and production, you will ensure test systems are robust, repeatable, and safe for hands-on execution by technicians. Your work will directly enable faster iteration, higher first-pass yield (FPY), and the reliable delivery of critical components for Helion's fusion prototypes. This is a hands-on role involving electrical test system development, data acquisition, and process ownership. You will report to the Production Manager and work closely with HV and LV Design Engineers, R&D Engineers, and Test Technicians/Supervisors. This is an onsite role at our Everett, WA office.

You Will:

Develop automated and semi-automated test systems for PCBA and high-voltage assemblies, including fixture design, instrumentation selection, and control software integration
Work with Contract Manufacturers (CMs) to deploy, validate, and maintain test systems in external facilities
Write and maintain test procedures, calibration standards, and test limits in collaboration with design engineers and production leadership
Support hands-on setup, wiring, and debugging of test racks, DAQ systems, and electrical interconnects
Develop and maintain data acquisition and automation tools using Python or PLC-based systems to increase throughput and reliability
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