SeniorExperimentalScientist

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: Helion is hiring a Senior Experimental Scientist to support and advance the plasma diagnostics capability for Helion’s fusion generators. In this role, you will be a key technical contributor for the design, deployment, calibration, and interpretation of plasma diagnostics across experimental campaigns and testbeds. This is an onsite role that reports directly to our Director of Plasma and Nuclear Science at our Everett, WA office. You Will: - Lead the design, build, deployment, calibration, and commissioning of plasma diagnostic systems for Helion’s fusion generators, with guidance from senior technical leadership on broader priorities and roadmap alignment - Serve as a go-to technical contributor for a defined diagnostics scope, helping evaluate plasma parameters such as density, temperature, current profiles, and other key performance indicators - Partner cross-functionally with plasma physics, machine operations, controls, mechanical en