Software Engineer

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 $1.5 billion from long-time investors such as Sam Altman, Mithril, and Capricorn Investment Group as well as new investors including Thrive Capital, LightSpeed Venture Capital, SoftBank, and others to propel us forward. Our current prototype, Polaris, has reached record-breaking plasma temperatures of 150 million degrees Celsius (13 keV). Helion is continuing to iterate and on the path to the world's first fusion power plant, Orion.

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 Senior Software Engineer on the Plant Control team, you will 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 own 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

• Own interfaces that connect distributed sensors, actuators, controllers, databases, and visualization tools

• Design and 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

• Architect and 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