Senior Test Engineer

About HelionWe 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 integrationWork with Contract Manufacturers (CMs) to deploy, validate, and maintain test systems in external facilitiesWrite and maintain test procedures, calibration standards, and test limits in collaboration with design engineers and production leadershipSupport hands-on setup, wiring, and debugging of test racks, DAQ systems, and electrical interconnectsDevelop and maintain data acquisition and automation tools using Python or PLC-based systems to increase throughput and reliabilityAnalyze test data to produce FPY and performance reports, proposing threshold adjustments in partnership with design teams to balance yield and qualityCollaborate with technicians and test supervisors to train and standardize best practices in test execution and safetyContinuously improve the efficiency, scalability, and maintainability of existing test systems across PCBA test equipment and HV test baysDrive cross-functional initiatives that reduce operator requirements and improve test cycle times without compromising safety or rigorRequired SkillsBachelor's degree in Electrical Engineering, Mechatronics, or related technical field5+ years of experience developing and supporting electrical or electronic test systems in R&D or production environmentsProficient with standard benchtop instruments such as oscilloscopes, power supplies, DMMs, Eloads, signal generators, and data acquisition equipmentExperience developing automated tests using Python or other PLC-based systemsExperienced in interpreting electrical schematics, PCB layouts, and wiring diagramsDemonstrated hands-on ability to build, wire, and debug test racks, harnesses, and control systemsUnderstanding of electrical safety principlesStrong analytical skills with experience generating and interpreting FPY or process capability reportsProven ability to collaborate across engineering and production teams to deliver robust, scalable solutions#LI-OnsiteBenefitsOur total compensation package includes benefits, including but not limited to: ... (truncated, view full listing at source)