Senior Network Security Engineer

Full Timesenior

Everett, WAPosted February 11, 2026

Job Description

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:

Our Senior Network Security Engineer will be responsible for designing, implementing, and maintaining secure network systems to protect Helion’s data and infrastructure from cyber threats. This role acts as the first line of defense against intrusions, ensuring that firewalls, routers, and monitoring tools are configured and managed effectively. This is an onsite role at our Everett, WA office, reporting directly to our System Security Manager.

Configure firewalls, intrusion detection/prevention systems (IDS/IPS), VPNs, and proxies
Use tools to detect suspicious activity, mitigate risks, and respond to incidents
Investigate network vulnerabilities, hardware malfunctions, and security breaches
Create and enforce network security policies, maintain system documentation, and ensure compliance with standards
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