---
title: 'Data Scientist at Fuse'
canonical: 'https://feeny.ai/job/data-scientist-fuse-san-leandro-sd2wk54ecdvh'
type: 'job'
last_seen: '2026-09-08'
---

# Data Scientist at Fuse

- **Company:** Fuse
- **Location:** San Leandro, CA
- **Compensation:** $145k–$190k
- **Employment:** full-time
- **Posted:** 2026-08-19
- **Last confirmed live:** 2026-09-08
- **Apply:** https://jobs.ashbyhq.com/fuse/7f0dec30-a531-4b55-aa06-0927359eb80d

## 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

You will build our in-house simulation stack — the models that predict what our fusion machines will do, and the inference machinery that pulls physics out of shot data. This is not a “fit a curve to a dashboard” data science role.

## CORE RESPONSIBILITIES

- Build a coupled simulation framework for our DPF: pulsed-power circuit, sheath formation and run-down (snowplow / slug / Lee-type models, progressing toward MHD), pinch and instability development, and neutron and X-ray production.
- Implement radiation source-term models: thermonuclear vs. beam-target neutron-yield decomposition, bremsstrahlung and line-emission spectra, and anisotropy.
- Develop surrogate and reduced-order models so designers and physicists can iterate on parameter sweeps without standing up an HPC job each time.
- Build the data pipeline that ingests every shot's diagnostic stream, including Rogowski coils, B-dots, silver activation, time-of-flight neutron detectors, filtered diodes, and fast cameras, and joins it to predicted output for systematic residual analysis.
- Quantify uncertainty seriously: Bayesian inference over model parameters, identifiability analysis, and honest error bars on yield predictions.
- Stand up simulations of supporting machine outputs, including anode/cathode lifetimes, electrode erosion models, and capacitor-bank aging, so operations decisions are informed by physics rather than vibes.
- Publish internally with the same standards you'd publish externally: derivations written out, assumptions stated, code reviewed.
- Eventually grow a small simulation team. For now, you will be a force multiplier of one.

## Minimum Qualifications

- PhD in Physics, Applied Mathematics, Plasma Physics, Computational Science, Nuclear Engineering, or a closely related field. An exceptional Master's candidate with a strong publication record will be considered.
- Strong academic record, with a target GPA of 3.8+ from a competitive program.
- Demonstrable depth in at least one of: magnetohydrodynamics, kinetic plasma theory, radiation transport, or pulsed-power circuit modeling. Familiarity with the others.
- Fluency in vector and tensor calculus, Maxwell's equations in arbitrary geometries, hyperbolic PDEs and numerical schemes, Bayesian statistics, and optimization under constraints.
- Production-grade Python using NumPy, SciPy, xarray, JAX, or PyTorch for differentiable physics, with comfort dropping into C++ or Fortran when Python isn't fast enough.
- Experience writing simulation code from scratch, not just running someone else's solver.
- Ability to read a physics paper, identify the load-bearing assumption, and determine quickly whether it applies to our regime.

## PREFERRED QUALIFICATIONS

- Hands-on experience with one or more of: MCNP, GEANT4, FLUKA, PIC codes such as LSP, EPOCH, or WarpX; MHD codes such as USim, FLASH, or HYDRA-class; or DPF-specific codes such as Lee model or GORGON-adjacent work.
- Prior work fitting models to noisy experimental diagnostics, including neutron TOF, X-ray spectroscopy, or magnetic-probe arrays.
- HPC experience including SLURM, MPI, GPU acceleration, and profiling at scale.
- Familiarity with the DPF literature or adjacent fields such as Z-pinch, MagLIF, or ICF, and a track record of getting up to speed quickly.
- Strong software-engineering hygiene: version control, tests for numerical code, and reproducible environments.

## 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

This is not a remote position and will require relocation if not already local to the applicable Fuse facility.

## 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.

## About Fuse

## Company Overview
- **One-liner**: Fuse is a fusion energy and defense company developing magnetized-liner inertial fusion (MagLIF) technology to deliver clean, on-demand power while providing radiation testing services for national security customers.
- **Entity Type**: Private (Series A)
- **Headquarters**: San Leandro, California, United States (operates "Fuseville" facility)
- **Founded**: 2018 (per CB Insights) or 2019 (per Wikipedia); founder J.C. Btaiche started the company at age 19
- **Founders**: J.C. Btaiche

## Core Business
- **Primary industry/industries**: Fusion energy, defense, nuclear effects testing, pulsed power engineering
- **Target customers**: U.S. government (Air Force, NNSA, national labs), defense contractors, eventually commercial energy utilities
- **Mission or purpose statement**: "Accelerating the World’s Transition to Fusion Energy" — building the fastest practical path to abundant, clean, safe, on-demand energy

## Products & Services
- **TITAN**: A 1 TW Impedance-Matched Marx Generator (IMG) — the essential MagLIF pulser building block. World’s first high-energy, high-power IMG, demonstrated in 2024 with results published in *Nature Scientific Reports*.
- **Z-Star**: A 15 TW MagLIF generator designed to iterate on and solve system engineering challenges (targeting 2027).
- **Apeiron I**: A pilot fusion plant design aiming to demonstrate a MagLIF hybrid plant core (targeting 203x).
- **FAETON I**: Neutron-producing fusion generator (over 1 trillion neutrons generated).
- **Radiation Testing Services (HEART)**: Hardened Electronics And Radiation Testing — providing short-burst radiation testing for government and commercial hardware resilience.

## Market Standing
- **Valuation**: Over $200 million as of September 2024 (per Bloomberg News)
- **Total Funding**: $32 million raised (Series A)
- **Key Metric**: 100+ employees; 2 patents filed; 53 employees as of 2024 (Wikipedia)
- **Notable Investors/Partners**: Bracket Capital, Tamarack Global, Buckley Ventures. Government partners: U.S. Air Force, National Nuclear Security Administration, Sandia National Laboratories, Los Alamos National Laboratory.
- **Growth Signals**: Awarded USAF contract (Feb 2024); published in *Nature Scientific Reports* (July 2024); former NNSA Administrator Lisa Gordon-Hagerty joined board; building Z-Star and Apeiron I platforms; operating a radiation facility covered by *Wired*.

## Competitive Advantages
- **MagLIF approach**: Integrates proven fusion technologies (magnetic and inertial) — demonstrated feasible by Sandia National Lab (2018, 2022). Fuse’s focus on engineering efficiency and affordability aims to solve repetition rate and cost barriers.
- **Rapid iteration**: Delivered two neutron-producing fusion generators and the world’s first IMG pulser in under three years, on time and on a lean budget.
- **Dual-use revenue model**: Generates revenue now through nuclear effects testing for defense customers while developing long-term fusion power — de-risking the path to commercial fusion.
- **Deep government relationships**: Contracts with USAF, NNSA, and CRADAs with Sandia and Los Alamos. Advisory board includes former Under Secretary of Energy, former CIA COO, former NSA Deputy Director, and senior military officers.
- **Patents**: 2 filed patents protecting core technology.

## Strategic Focus
- **Immediate**: Scale the pulsed power driver technology (Z-Star) and continue delivering radiation testing services to defense and intelligence customers.
- **Medium-term**: Demonstrate a MagLIF hybrid plant core with Apeiron I.
- **Long-term**: Deploy commercial fusion power plants, achieving 90% energy efficiency and enabling clean, on-demand energy at scale.
- **Talent**: Aggressively hiring for plasma physics, electrical engineering, pulse power, mechanical engineering, and experimental physics roles.

## Why Work Here
- **Culture**: Described as "misfits, tinkerers, skeptics, doers" — drawn to impossible problems. Values include frugality, speed, hands-on experimentation, and deep technical conviction. "Fuse is not a comfortable environment" — no bean bag chairs; many live, eat, and work at the facility.
- **Work environment**: "Fuseville" — a shipping-container communal living facility adjacent to the lab. Bed-to-reactor commute under 60 seconds. Sleep pods available. You'll likely build your own desk. "We really skimp on furniture."
- **Compensation**: Low salaries — "you should be willing to work for free. While you will receive a minimum base so that you can survive, money and lifestyle is not the motivator." Significant stock option upside if fusion succeeds. "Fair wages. Long hours. High voltage. Success far from guaranteed."
- **Benefits**: Competitive healthcare plan. High-end computer setup and cloud computing resources. "Everyone on the team has skin in the game."
- **Who should apply**: Self-motivated, deeply internally driven, humble yet brilliant, fusion geeks who built Polywells in high school, boundary-pushers who "get shit done." Must be comfortable with deferred gratification and high risk.
- **Remote/hybrid policy**: Not explicitly stated, but the "Fuseville" on-site living model suggests heavy in-person presence is expected. "Commuting makes your blood boil" is a stated value.
- **Notable perks**: Working on one of humanity’s hardest problems alongside top 1% talent; national security impact; potential enormous financial reward via stock options; "glory in case of ignition."

## Sources
1. [f.energy](https://www.f.energy/)
2. [f.energy - About](https://www.f.energy/about-fuse-energy)
3. [f.energy - Join Us](https://www.f.energy/join-us)
4. [CB Insights](https://www.cbinsights.com/company/fuse-energy-technologies)
5. [Wikipedia](https://en.wikipedia.org/wiki/Fuse_Energy_Technologies_Corporation)
6. [Jobs page](https://jobs.ashbyhq.com/fuse)

## Other roles at Fuse

- [Health Physicist](https://feeny.ai/job/health-physicist-fuse-albuquerque-gddj5k91cqf5) — Albuquerque, NM
- [Head of Government Affairs](https://feeny.ai/job/head-of-government-affairs-fuse-washington-19z8bhwga0xj) — Washington, DC
- [Director, Defense Prime Partnerships](https://feeny.ai/job/director-defense-prime-partnerships-fuse-washington-1fz4np6nf5jd) — Washington, DC
- [Director of Commercial Partnerships](https://feeny.ai/job/director-of-commercial-partnerships-fuse-san-leandro-amvyfmb02jh8) — San Leandro, CA
- [Director of Contracts](https://feeny.ai/job/director-of-contracts-fuse-washington-jwcd5z44856p) — Washington, DC
- [Technician](https://feeny.ai/job/technician-fuse-albuquerque-9fazbpqp0gzv) — Albuquerque, NM
- [Mechanical Engineer](https://feeny.ai/job/mechanical-engineer-fuse-albuquerque-d3egysth0c2j) — Albuquerque, NM
- [Nuclear Engineer](https://feeny.ai/job/nuclear-engineer-fuse-albuquerque-4chd0t98cjqe) — Albuquerque, NM
- [Electrical Engineer](https://feeny.ai/job/electrical-engineer-fuse-albuquerque-abg052tz50qy) — Albuquerque, NM
- [Capture & Proposal Writer](https://feeny.ai/job/capture-proposal-writer-fuse-washington-y496kamec4kz) — Washington, DC