A

Avalanche

Develops compact modular micro-fusion reactors

Research Software Engineer

Full-TimePosted on 10/26/2026
$115k - $150k/yr+ Equity
Mid
Bachelor's
Tukwila, WA, USA
In Person
Software Engineering

About the job

Requirements
  • An undergraduate degree in computer science, physics, or a related discipline.
  • Ability to work with a diverse team and make progress in ambiguous environments.
  • Ability to explain complex methodologies to scientists, engineers, and management.
  • Experience developing and maintaining reusable Python packages.
  • Experience with automated testing, Git-based version control, and collaborative code review.
Responsibilities
  • Develop and maintain standards for common scientific data-processing and analysis toolboxes under scientific guidance.
  • Develop and maintain common scientific data-processing and analysis toolboxes under scientific guidance.
  • Translate written or verbal analysis methods into reviewed, maintainable, tested, and reusable Python modules.
  • Work with diagnostic experts to develop and maintain software for processing data.
  • Establish and maintain standards for code review, testing, documentation, packaging, and release management.
  • Review analysis code for correctness, maintainability, and consistency.
  • Incorporate feedback from scientists and engineers into shared analysis tools.
  • Collaboratively develop clear and effective scientific data visualizations.
  • Support the transition of exploratory scripts into standardized analysis software.
Desired Qualifications
  • Experience interfacing with scientific instrumentation.
  • Prior work in fast-paced research and development environments.
  • Experience with scientific computing Python packages.
  • Experience with data storage systems such as S3.
  • Experience maintaining cloud infrastructure.
  • Familiarity with common data-processing concepts such as fast Fourier transforms, smoothing algorithms, and error propagation.

About the company

Avalanche Energy develops compact, modular fusion reactors for portable clean power. Its Orbitron is a desk-sized micro-fusion reactor that uses electrostatic confinement for ions and magnetic fields for electrons, with 5 kW modular cells that can be stacked to reach higher power. The company competes by prioritizing a small form factor and faster design, build, and test cycles instead of large, expensive tokamaks. Its targets include space propulsion, remote microgrids, trucking, and shipping, with a secondary stream to produce high-energy neutrons for radioisotope production and materials testing through its FusionWERX facility.

Company Size

51-200

Company Stage

Grant

Total Funding

$112.5M

Headquarters

Tukwila, Washington

Founded

2018

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Simplify's Take

What believers are saying

  • Avalanche raised $29 million in February 2026, backing buildout and hiring.
  • DARPA awarded Avalanche $5.2 million on April 8, 2026 for radiovoltaics.
  • Washington's $10 million grant funds FusionWERX, targeting 2027 tritium-capable operations.

What critics are saying

  • FusionWERX depends on radioactive materials licensing; any 2027 slip delays customer validation and revenue.
  • Avalanche still lacks demonstrated net-energy fusion; if Q>1 never arrives, the company becomes a defense subcontractor.
  • Diversifying into radiovoltaics and AFWERX materials risks mission drift before compact fusion commercialization.

What makes Avalanche unique

  • Avalanche’s 9-centimeter reactor and 25-centimeter upgrade emphasize fast iteration over tokamak megaprojects.
  • FusionWERX in Richland gives Avalanche proprietary commercial-scale test infrastructure competitors lack.
  • DARPA radiovoltaics, DIU space power, and fusion share one compact high-voltage platform.

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Benefits

  • Health Insurance
  • Dental Insurance
  • Vision Insurance
  • Paid Vacation
  • Paid Sick Leave
  • Paid Holidays
  • Stock Options

Growth & Insights and Company News

6 month growth

-1%

1 year growth

-3%

2 year growth

-4%
PR Newswire
Jun 10th, 2026
Avalanche Energy's compact fusion device reaches 11M°C in breakthrough milestone

Avalanche Energy, a Seattle-based fusion technology company, has announced that its compact fusion plasma device "Jyn" achieved measured ion energies corresponding to apparent temperatures exceeding 1 kiloelectron volt (1 keV), or approximately 11 million degrees Celsius — comparable to the sun's core. The achievement marks a significant milestone for the company's approach of rapidly iterating small-form-factor fusion systems. At less than five inches in diameter, Jyn has undergone over 25 iterations since last autumn. The device is small enough to fit on a truck yet reached the 1 keV threshold, a significant performance benchmark for fusion systems. Avalanche published a technical report detailing its methodology, which was externally reviewed by an independent technical adviser. The company aims to develop compact fusion systems for defence, space, industrial and power-generation applications.

Energy Tech
Apr 10th, 2026
Avalanche Energy secures $5.2M DARPA funding to develop fusion-powered batteries for military

Avalanche Energy has secured $5.2 million in funding from DARPA to develop fusion-powered battery systems for military applications. The 30-month award, granted through DARPA's Rads to Watts programme, will support development of solid-state, micro-fabricated cells that convert radioisotope-produced alpha particles into electricity. The technology targets defence and space situations where traditional batteries, refuelling and solar power are impractical. Avalanche will lead a team including the University of Utah, Caltech, Los Alamos National Laboratory and McQuaide Microsystems. The funding comes after Avalanche raised $29 million earlier this year led by RA Capital Management, with participation from 8090 Industries, Overlay Capital, Congruent Ventures, Founders Fund, Lowercarbon Capital and Toyota Ventures.

Center of Excellence for Clean Energy
Apr 9th, 2026
Avalanche Energy awarded contract with DARPA to develop new radiovoltaics.

Avalanche Energy awarded contract with DARPA to develop new radiovoltaics. Earlier this week, Avalanche Energy was awarded a $5.2 million contract from DARPA's Rads to Watts program to develop new radiovoltaics. The Pentagon research agency is interested in using the materials in a new class of long-lasting nuclear batteries, which use radioactive decay from materials like polonium to generate electricity. These nuclear batteries could power satellites and spacecraft for several years, or be used in more energy-intensive terrestrial military applications for days on end. Avalanche is focused on engineering micro-fabricated energy cells that turn alpha particles emitted by radioactive material into electricity. The process, the team said, is analogous to solar cells converting photons into electricity. "The goals are to produce a device that has a long lifetime, and that can produce orders of magnitude more power than current technologies," said Daniel Velázquez, Avalanche's physicist and materials science lead. The target is a battery that could continuously power a laptop computer, for example, for many months but weighs roughly 10 pounds. Avalanche is leading the team tackling DARPA's nuclear battery challenge, which includes the University of Utah, Caltech, Los Alamos National Laboratory and McQuaide Microsystems. While Avalanche is ultimately working to develop a compact device that creates energy from fusion - the reactions that power the sun - the DARPA project feeds directly into that longer-term goal, Velázquez said. There are direct parallels to capturing energy from a nuclear battery and from fusion reactions. Read more:

Avalanche Fusion
Feb 4th, 2026
Avalanche Energy | Avalanche Energy Raises $29 Million Following Plasma Physics Breakthroughs

New investors include 8090 Industries, Overlay Capital, and others, with full participation from existing investors Congruent Ventures, Founders Fund, Lowercarbon Capital, and Toyota Ventures, demonstrating increased confidence in Avalanche's technical progress and commercial roadmap.

Bloomberg
Feb 3rd, 2026
Fusion startup Avalanche Energy raises $29M to build desktop-sized reactors

Avalanche Energy has raised $29 million in an oversubscribed funding round led by RA Capital Management to develop desktop-sized fusion reactors. The Seattle-based startup aims to create compact power plants for satellites, underwater drones and remote bases. Overlay Capital joined as a new investor, alongside existing backers Congruent Ventures and Lowercarbon Capital. The company is working on miniaturised fusion technology that could provide portable power solutions for specialised applications requiring independent energy sources in challenging environments.