Fuse
Energy & UtilitiesDirect Ashby career site

Nuclear Engineer

Location
San Leandro, CA · On-site
Job type
Full-time
Level
Mid-level
Education
Master's degree
Listed
23 days ago

Skills & highlights for this role

  • security clearance
  • MCNP
  • Geant4
  • radiation shielding design
  • neutron and gamma detection
  • Python

Also useful

  • FLUKA
  • FUSE fusion facility experience
  • radiation metrology calibration

Stated benefits & perks

  • Medical
  • Dental
  • Vision
  • Flexible pto

About the Role

As a Nuclear Engineer at Fuse, you'll bring expertise in particle transport, Monte Carlo simulation, radiation shielding, and radiation diagnostics to our fusion facility.

You'll develop and implement radiation diagnostics for facility operations and experimental characterization and work closely with physicists and engineers to advance our diagnostic capabilities.

Core Responsibilities

  • Implement and optimize neutron and gamma diagnostic systems for radiation characterization in fusion experiments and conduct experimental validation of neutron and gamma detection systems.
  • Analyze radiation data to support experimental campaigns, including source characterization, spectral unfolding, and spatial/temporal diagnostics.
  • Perform radiation-transport analysis to improve system performance and safety.
  • Develop and maintain radiation test environments for detector calibration and material testing.
  • Develop and apply Monte Carlo simulations such as MCNP, Geant4, or FLUKA for particle transport, shielding, dose assessment, and detector performance.
  • Design and optimize radiation shielding for mixed neutron and gamma environments.
  • Support meteorological assessments related to radiation dispersion and environmental safety.
  • Analyze radiation data for operational safety, shielding effectiveness, and compliance with regulatory requirements.
  • Collaborate with multidisciplinary teams on fusion technology development and radiation-safety initiatives.

Minimum Qualifications

  • Master's or PhD in Nuclear Engineering, Physics, or a related field.
  • Strong experience in Monte Carlo particle-transport simulations using MCNP, Geant4, FLUKA, or similar tools.
  • Hands-on experience with neutron and gamma detection techniques.
  • Knowledge of radiation shielding, dose calculations, and safety assessments.
  • Experience in radiation metrology and calibration techniques.
  • Proficiency in data analysis and programming using Python, MATLAB, C++, or similar tools.
  • Familiarity with regulatory frameworks including CNSC, NRC, and IAEA standards.

Preferred Qualifications

  • Experience working in fusion/fission facilities or similar combined neutron-gamma radiation environments.
  • Background in high-energy neutron/gamma transport and shielding.
  • Knowledge of advanced radiation-detection technologies.

What We Value

  • Give a shit. Build things you're proud of.
  • Take responsibility. If something is broken and you can fix it, fix it. See things through.
  • Move fast. Make decisions, learn quickly, and keep moving forward.
  • Think bigger. Simplify relentlessly. Don't default to the safe answer.
  • Disagree and commit. The best idea wins. Once a decision is made, we move.
  • Desire to win. This is hard. Expect intensity. We are here to win.
  • Plan B is to make Plan A work.

Additional Requirements

  • Must be able to travel and work extended hours/weekends as needed.
  • Security Clearance
  • This role may require the ability to obtain and maintain a U.S. government security clearance.

Benefits

  • Medical, dental, and vision coverage.
  • Relocation assistance for roles that require it.
  • Flexible time off. Take what you need, no accrual tracking.
  • 2 weeks of paid time off built into the end of each year, subject to team and business needs.
  • Supportive leave of absence policies.
  • Paid leave for new parents.

Itar Requirements

To conform to U.S. Government technology export regulations, including the International Traffic in Arms Regulations (ITAR), you must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State.

About Fuse

We are building one of the most potentially consequential companies of the century. Our mission is to accelerate the world's transition to fusion energy while safeguarding humankind. This is not a normal company. This is not a normal job. We are committed for the long term to win.

Read the original posting

From Fuse's careers page, first listed on Rolev.ai on October 17, 2026. Rolev.ai is not the employer.

How Rolev.ai helps with this application

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Common questions

Where is the Nuclear Engineer job at Fuse located?

This Nuclear Engineer position at Fuse is located in San Leandro, CA (On-site). Always check Fuse's application page for specific state eligibility or relocation policies.

What qualifications are required for Nuclear Engineer at Fuse?

For the Nuclear Engineer role, Fuse highlights a master's degree; experience with MCNP, Geant4, radiation shielding design, neutron and gamma detection, Python. Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.

How do I apply for the Nuclear Engineer position at Fuse?

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