Nuclear Engineer

Fuse; San Leandro (CA); On-site; USD 140,000 - 210,000; Full time

Benefits offered by this job

Medical, dental, and vision coverage

Relocation assistance

Flexible time off

Paid time off at year end

Leave policies

Paid parental leave

Job summary

Fuse in California seeks a Nuclear Engineer to advance radiation diagnostics and shielding for our fusion research facility.

You will implement Monte Carlo simulations (MCNP, Geant4, FLUKA) and develop detector calibration environments while collaborating with physicists and engineers to push diagnostic capabilities and safety compliance.

The role requires a PhD or Master’s in a relevant field, strong coding in Python/MATLAB/C++, and willingness to travel and obtain security clearance as needed.

Qualifications

• Master’s or PhD in Nuclear Engineering, Physics, or a related field.
• Experience with Monte Carlo particle-transport simulations (MCNP/Geant4/FLUKA).
• 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 (Python, MATLAB, C++).
• Familiarity with CNSC, NRC, and IAEA standards.

Responsibilities

• Implement and optimize neutron and gamma diagnostic systems for radiation characterization in fusion experiments.
• Analyze radiation data to support experiments, including source characterization and spectral unfolding.
• 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 for particle transport, shielding, dose assessment, and detector performance.
• Design and optimize radiation shielding for mixed neutron and gamma environments.
• Support regulatory and environmental safety assessments for radiation dispersion.

Skills

Hands‑on radiation detection

Data analysis

Regulatory frameworks

Education

Master's or PhD in Nuclear Engineering or Physics

Tools

MCNP

Geant4

FLUKA

Python

MATLAB

C++

Job description

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.

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.

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.

Equal Opportunity

Fuse is an Equal Opportunity Employer; employment with Fuse is governed on the basis of merit, competence, and qualifications and will not be influenced by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, ancestry, immigration status, sexual orientation, gender identity, marital status, mental or physical disability, or any other legally protected status.