---
title: 'Experimental Scientist at Helion'
canonical: 'https://feeny.ai/job/experimental-scientist-helion-everett-eztvzcr97xjh'
type: 'job'
last_seen: '2026-11-07'
---

# Experimental Scientist at Helion

- **Company:** [Helion](https://feeny.ai/companies/helion)
- **Location:** Everett, WA
- **Compensation:** $150k–$200k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-06-24
- **Last confirmed live:** 2026-11-07
- **Apply:** https://jobs.ashbyhq.com/helion/e22479a1-1707-47c3-9dad-c07db50de815/application

**Skills:** Plasma science, Plasma diagnostics, High-vacuum systems, Pulsed-power systems, Interferometry, Spectroscopy, Langmuir probes, Magnetic coils, Electrostatic diagnostics, Optical diagnostics, Experimental hardware operation, Data analysis

> Helion Energy is hiring an Experimental Scientist to support the design, build, and operation of plasma diagnostics for fusion generators. The role involves hands-on experimental work, data analysis, and cross-functional collaboration to advance fusion technology.

## 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 $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: Helion is hiring an Experimental Scientist to support the development, deployment, calibration, and operation of plasma diagnostics for Helion’s fusion generators. In this role, you will contribute to hands-on experimental work across plasma diagnostics, test campaigns, and high-vacuum systems while partnering closely with scientists, engineers, machine operators, and data teams. This is an onsite role that reports directly to our Director of Plasma and Nuclear Science at our Everett, WA office. You Will:

- Support the design, build, deployment, calibration, and commissioning of plasma diagnostic systems for Helion’s fusion generators, operating with autonomy on defined tasks and workstreams while escalating technical risks or tradeoffs when appropriate
- Contribute to the operation and troubleshooting of plasma diagnostics used to evaluate plasma parameters such as density, temperature, current profiles, and other key performance indicators
- Work cross-functionally with plasma physics, machine operations, controls, mechanical engineering, electrical engineering, and data science teams to support diagnostic readiness for experimental campaigns and testbeds
- Develop hands-on expertise in pre-ionization plasma diagnostics, helping establish consistent methods and practices that support next-generation fusion device development
- Analyze diagnostic data to identify trends, support experimental interpretation, and inform operational tuning, hardware improvements, or follow-up testing
- Document experimental procedures, calibration methods, test results, and lessons learned to improve consistency, reliability, and knowledge sharing across Helion’s experimental programs

Required Skills:

- Ph.D. in physics, electrical engineering, aerospace engineering, or a related discipline, with a focus on plasma science, diagnostics, or high-vacuum instrumentation
- Relevant hands-on experience with plasma systems, advanced laboratory environments, high-vacuum systems, pulsed-power systems, or complex experimental hardware
- Experience supporting the design, build, calibration, troubleshooting, or operation of plasma diagnostics such as interferometry, spectroscopy, Langmuir probes, magnetic coils, electrostatic diagnostics, optical diagnostics, or related measurement systems
- Ability to operate autonomously on day-to-day technical tasks, apply critical thinking across multiple inputs, and escalate issues appropriately when technical risk, scope, or priority requires broader alignment

## 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

Helion is an equal opportunity employer and value diversity at our company. We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. If you need assistance or an accommodation during the interview process, please let us know.

## About Helion

## Company Overview
- **One-liner**: Helion is building the world’s first fusion power plant to deliver clean, reliable, and affordable baseload electricity.
- **Entity Type**: Private (Series G – $465M raised in 2026 at a $15.5B post-money valuation, led by Thrive Capital)
- **Headquarters**: Everett, Washington, USA (with additional facilities in Chelan County, WA)
- **Founded**: 2013
- **Founders**: David Kirtley (CEO), Anthony Pancotti, and others

## Core Business
- **Primary industry**: Fusion energy generation (clean energy / climate tech)
- **Target customers**: B2B – utilities, large-scale energy buyers (e.g., Microsoft, Nucor), and data center operators
- **Mission**: Build the world’s first fusion power generators to provide clean, reliable, and affordable electricity for everyone.

## Products & Services
- **Polaris**: The latest prototype fusion machine – a 19‑meter device with 50 MJ capacitor banks that demonstrated deuterium‑tritium fusion in early 2026. It is a pulsed, field‑reversed configuration (FRC) reactor designed to directly convert fusion energy into electricity (no steam turbine).
- **Orion**: The planned first commercial fusion power plant, targeting 50 MW of electricity to Microsoft data centers by 2029. Modular, factory‑built generators that can be shipped to customers.
- **HERCULES Program**: A $4M initiative funding 20 research institutions to develop enabling technologies for scaled fusion deployment.

## Market Standing
- **Valuation**: $15.5 B (post‑money Series G, 2026)
- **Key Metric**: Total funding raised – $465 M (Series G) plus prior rounds (undisclosed total). Annual revenue not applicable (pre‑revenue).
- **Notable Investors/Partners**: Sam Altman (early backer, recently stepped off board), Thrive Capital (lead Series G), Microsoft (first PPA for fusion energy), Nucor (500 MW development deal)
- **Growth Signals**: ~600 employees (up from 51‑200 in earlier years); Polaris achieved first privately‑developed DT fusion demonstration; signed first ever fusion power purchase agreement (Microsoft); expanding manufacturing capacity in Washington.

## Competitive Advantages
- **Direct energy conversion**: Helion’s pulsed FRC design recovers electricity directly from the expanding plasma at >95% efficiency, skipping the inefficient steam cycle used by most fusion concepts.
- **Pulsed approach**: The reactor pulses rapidly (sub‑second), producing fusion energy in bursts that can be synchronized to the grid, and uses solid‑state switches capable of hundreds of millions of pulses.
- **Simpler magnets**: FRC plasma is self‑confining, requiring fewer and lower‑field magnets than tokamaks or stellarators, reducing cost and complexity.
- **Fuel flexibility**: Uses deuterium and tritium (with tritium breeding planned) and ultimately can burn advanced fuels (D‑D, D‑He3) as the technology matures.

## Strategic Focus
- **Commercial deployment**: Delivering 50 MW to Microsoft by 2029 (Orion plant); scaling up manufacturing to produce modular generators in factories.
- **Technology maturation**: HERCULES program to solve tritium breeding, materials, and other enabling challenges; advancing Polaris toward net electricity generation.
- **Partnership growth**: Expanding power purchase agreements and development deals with industrial and tech customers to meet surging demand (especially AI data centers).

## Why Work Here
- **Culture**: “Urgency, rigor, ownership, and hard truths” – a mission‑driven environment focused on solving the hardest problems in fusion engineering.
- **Work**: Hands‑on with real hardware (capacitors, magnets, plasma diagnostics) across mechanical, electrical, and physics disciplines.
- **Location**: Based in the Pacific Northwest (Everett & Chelan County) with immediate access to skiing, hiking, and water sports.
- **Benefits**: Premier medical/vision/dental (fully employer‑paid options), HSA contributions, wellness stipend, 5% 401(k) match, stock options, up to 12 weeks paid parental leave + 4 weeks for birthing parents, 21 vacation days, 10 sick days, 11 holidays + winter break.
- **Hybrid/Remote**: Not explicitly stated; roles appear to be on‑site in Washington (given the hardware‑focused nature).
- **Open Roles**: Engineers (mechanical, electrical, simulation, controls), magnet analysts, experimental scientists, technicians, machinists – over 100 positions listed.

## Sources
1. [helionenergy.com](https://www.helionenergy.com/) – Company overview, funding, technology, updates
2. [helionenergy.com/careers](https://www.helionenergy.com/careers) – Careers page, values, benefits
3. [helionenergy.com/careers/open-positions](https://www.helionenergy.com/careers/open-positions) – Current job listings
4. [scientificamerican.com](https://www.scientificamerican.com/article/helion-energy-is-building-a-fusion-power-plant-can-its-technology-deliver/) – In‑depth profile, 600 employees, Microsoft PPA, Polaris details
5. [indeed.com](https://www.indeed.com/cmp/Helion-Energy?campaignid=mobvjcmp&from=mobviewjob&fromjk=9e3fd74c2e72805f&tk=1jrv4ci0di9cp800) – Company size, revenue, 108 jobs

## Other roles at Helion

- [Second Shift Senior Maintenance Technician](https://feeny.ai/job/second-shift-senior-maintenance-technician-helion-everett-nr8p4r47y421) — Everett, WA
- [Machine Maintenance and Integration Engineer](https://feeny.ai/job/machine-maintenance-and-integration-engineer-helion-everett-4q9tkkrkztp1) — Everett, WA
- [Director of Generator Operations](https://feeny.ai/job/director-of-generator-operations-helion-everett-k2y36vzm123v) — Everett, WA
- [Manager, Generator Operations](https://feeny.ai/job/manager-generator-operations-helion-everett-ze1ps97ykf9m) — Everett, WA
- [Senior Controls Maintenance Technician](https://feeny.ai/job/senior-controls-maintenance-technician-helion-everett-6pj2pqepmn7f) — Everett, WA
- [Senior Automation Technician](https://feeny.ai/job/senior-automation-technician-helion-everett-myh7x3fdh8es) — Everett, WA
- [Senior PLC Technician](https://feeny.ai/job/senior-plc-technician-helion-everett-yv3vrmfk2nya) — Everett, WA
- [Executive Assistant](https://feeny.ai/job/executive-assistant-helion-everett-skfzkbvnrpg6) — Everett, WA
- [Senior Welder](https://feeny.ai/job/senior-welder-helion-everett-h1975nzhzwr0) — Everett, WA
- [Senior Semiconductor Device Engineer](https://feeny.ai/job/senior-semiconductor-device-engineer-helion-everett-m4wx2tfjv6cr) — Everett, WA