HPM ENGINEER, KLYSTRONS & GYROTRONS

← All roles Stellios Technologies is building advanced high power microwave and energy systems for defense, aerospace, and energy. We are hiring an exceptional HPM Engineer to design, build, test, and scale high power microwave sources, with an initial focus on klystrons and gyrotrons. This is not a purely theoretical or simulation role. You will work directly with hardware and own major parts of the path from first principles design through fabrication, integration, power testing, failure analysis, and design iteration. What You Will Own And/Or Support RF and beam wave interaction design for klystrons, gyrotrons, and related vacuum electronic devicesResonant cavities, interaction structures, mode selection, output structures, waveguide components, RF windows, and related microwave hardwareElectron beam transport and electron optics in coordination with electron gun and magnet engineeringElectromagnetic, particle, and multiphysics simulation used to predict device performance before hardware is builtHigh voltage, high vacuum, and high power RF testing, diagnostics, commissioning, and troubleshootingRoot cause analysis when measured performance does not match simulation or design targetsMechanical tolerances, materials, thermal constraints, brazing and joining considerations, vacuum compatibility, and design for manufacturabilityTechnical reviews with internal engineers, external experts, machine shops, vacuum tube manufacturers, and critical component suppliersTransition of successful prototypes into repeatable production hardware Who We Are Looking For You Must Have One Of The Following A PhD in electrical engineering, physics, applied physics, accelerator science, plasma physics, or a directly relevant field, orA BS or MS in a relevant technical field plus at least 5 years of directly relevant professional experience Direct klystron or gyrotron experience is strongly preferred, but it is not mandatory. We will consider exceptional engineers who have built adjacent high power, high voltage microwave systems or components, including traveling wave tubes, magnetrons, electron beam systems, accelerators, pulsed RF systems, high power RF sources, or closely related hardware. You need strong fundamentals in electromagnetics and high power microwave engineering, plus real hardware judgment. We care more about what you have personally designed, built, tested, debugged, and made work than about credentials alone. You should be comfortable working around high voltage, vacuum systems, RF diagnostics, precision microwave hardware, and multidisciplinary engineering teams. This role requires access to U.S. export controlled information. Candidates must qualify as a U.S. person under applicable export control laws, including U.S. citizens, U.S. nationals, lawful permanent residents, refugees, and asylees. You must be willing to work on site in Southern California or Austin. Competitive compensation and meaningful equity. Apply for this roleTechnical screening, résumé, and a few focused questions.