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 and 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). Now, we're turning up operations for Polaris, working towards delivering the world's first fusion power plant.
More than ever, it's a pivotal time to join us and have the opportunity to solve real challenges to create a better energy future. You will see first-hand how we value urgency, rigor, ownership, and hard truths, knowing it will take each to do what no one has before. Joining us, you will push the boundaries of what's possible and transform humanity for the better - because the world can't wait.
What You Will Be Doing:
We are seeking an experienced Senior Nuclear Engineer to support Helion’s efforts in nuclear engineering needs. This includes supporting the fusion neutronics, shielding, activation analysis, and diagnostics support. You will prepare reports and coordinate with cross-functional teams to integrate neutron diagnostics, support radiation safety, and ensure compliance with regulatory requirements. This is an onsite role at our Everett locations, and you will be reporting directly to the Nuclear Engineering Manager.
You Will:
- Conduct comprehensive radiation transport, shielding, and activation simulations for Helion fusion devices
- Create the workflow to estimate dose, decay heat during operation, and shutdown conditions for Helion fusion generators
- Utilize variance reduction and other methods to reduce computation run time
- Collaborate with Helion Science and Engineering teams throughout the design, development, and deployment phases of Helion fusion devices
- Communicate technical results and findings with accuracy and rigor to diverse audiences by preparing reports, presentations, and GUIs
Required Skills:
- 5+ years of experience in nuclear engineering, with a focus of neutronics, shielding, and activation analysis of nuclear systems
- Nuclear Physics Expertise with strong knowledge of neutron and photon interactions, cross sections, attenuation, decay, and radiation types
- Monte Carlo Radiation Transport codes hands-on experience (e.g., Attila, MCNP, OpenMC, Geant4, FLUKA)
- Experience with activation analysis (e.g., FISPACT, CINDER) and CAD to MC conversion (e.g., DAGMC, GEOUNED)
- Proficient in Python, MATLAB, or C++ for data analysis and HPC cluster job submissions
- Proven ability to validate simulations against experimental data
#LI-Onsite #LI-KL1
Compensation and Benefits
At Helion, we are committed to fostering a fair and equitable environment in every aspect of our operations, including compensation. We ensure all our roles are competitively benchmarked and our total compensation package includes a base salary, comprehensive benefits, and equity grants, giving you a true stake in Helion's success. Final compensation is determined through a holistic evaluation of your experience, qualifications, and our commitment to maintaining internal equity, ensuring fairness and transparency across our teams.
This is an exempt salaried role.
Annual Base Pay
$130,000—$190,000 USD
Benefits
Our total compensation package includes benefits, including but not limited to:
- Medical, Dental, and Vision plans for employees and their families
- 31 Days of PTO (21 vacation days and 10 sick days)
- 10 Paid holidays, plus company-wide winter break
- Up to 5% employer 401(k) match
- Short term disability, long term disability, and life insurance
- Paid parental leave and support (up to 16 weeks)
- Annual wellness stipend
NOTE: Underrepresented people are less likely to apply unless they meet 100% of the job's requirements. We believe in hiring people, not checklists, and encourage you to apply even if you do not check all of the boxes. If this job isn't the one, we have many other openings that may be a fit.
All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, disability, age, sexual orientation, gender identity, national origin, veteran status, or genetic information. If we reach out to you to begin an interview process, we will also ask if you require any reasonable accommodation at that time.
Top Skills
What We Do
Helion is a fusion power company based in Everett, WA, with the mission to enable a future with unlimited clean energy. Our vision is a world with clean, reliable, and affordable electricity for everyone. Currently, we are scaling up our latest fusion prototype to make our vision a reality.
We’re hiring brilliant scientists, engineers, and builders passionate about developing world-changing technologies. If that sounds like you, check out our open positions.
