Software Engineer, Plant Control

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 As a Software Engineer on the Plant Control team, you will help design, build, and scale the software systems that operate Helion’s fusion generators and the Orion fusion power plant. You will work across control systems, diagnostics, data infrastructure, operator interfaces, automation, and integration with electrical, mechanical, firmware, and science teams. This is a generalist software role for someone who is comfortable moving between architecture and implementation, prototypes and production systems, and high-level plant design and hands-on machine operation. You will build software that interfaces with real hardware, supports rapid engineering iteration, and helps turn experimental fusion systems into reliable power plant infrastructure. You will work onsite at our Everett, WA office. YOU WILL - Design, build, and maintain software for plant control, diagnostics, automation, and operator workflows - Develop interfaces that connect distributed sensors, actuators, controllers, databases, and visualization tools - Build reliable tools for monitoring machine health, system performance, test execution, and plant operations - Create and improve graphical user interfaces for engineers, operators, and scientists working with fusion machines and testbeds - Implement software that supports real-time control, data acquisition, and system coordination - Work with Electrical Engineering, Firmware, Mechanical Engineering, IT, Operations, and Science teams to integrate software with complex hardware systems - Improve the reliability, usability, and scalability of Helion’s internal control and diagnostic platforms - Investigate and introduce new tools, frameworks, and infrastructure that accelerate engineering development - Apply first-principles thinking to ambiguous technical problems where the right answer is not yet obvious REQUIRED SKILLS - Bachelor’s degree in Computer Science, Computer Engineering, Electrical Engineering, Physics, or a related technical field, or equivalent practical experience - 2+ years of professional software engineering experience - Strong programming ability in a systems programming language such as C++, Rust, or similar - Experience with Python or another high-level scripting language - Experience building software that interfaces with hardware, sensors, instruments, control systems, or other real-world systems - Comfortable working in Linux environments - Experience designing maintainable software systems, including testing, version control, debugging, and deployment practices - Ability to work across the full software lifecycle, from requirements gathering and prototyping through production support - Strong systems-level problem-solving skills and ability to debug issues across software, hardware, networks, and data flows - Ability to collaborate closely with engineers and scientists from multiple disciplines - Willingness to work onsite and stay close to the hardware, operators