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Geant4 Jobs (NOW HIRING)

True Anomaly

Radiation Engineer II

Denver, CO · On-site

$95K - $130K/yr

Familiarity with radiation transport and shielding analysis tools (NOVICE, FASTRAD, GEANT4) * Familiarity with circuit simulation tools such as LTSpice or PSpice * Familiarity with space charging ...

Blue Origin

Radiation Effects Engineer II

Denver, CO · On-site

$99K - $138K/yr

MCNP, NOVICE, FASTRAD, GEANT4, OLTARIS) * Familiarity with the following: * radiation assessments and mitigation for human space crews * radiation effects on spacecraft materials * laboratory ...

Blue Origin

Radiation Effects Engineer II

Phoenix, AZ · On-site

$99K - $138K/yr

MCNP, NOVICE, FASTRAD, GEANT4, OLTARIS) * Familiarity with the following: * radiation assessments and mitigation for human space crews * radiation effects on spacecraft materials * laboratory ...

Blue Origin

Radiation Effects Engineer II

Reston, VA

$99K - $138K/yr

MCNP, NOVICE, FASTRAD, GEANT4, OLTARIS) * Familiarity with the following: * radiation assessments and mitigation for human space crews * radiation effects on spacecraft materials * laboratory ...

Blue Origin

Radiation Effects Engineer II

Seattle, WA

$99K - $138K/yr

MCNP, NOVICE, FASTRAD, GEANT4, OLTARIS) * Familiarity with the following: * radiation assessments and mitigation for human space crews * radiation effects on spacecraft materials * laboratory ...

Blue Origin

Radiation Effects Test Engineer II

Seattle, WA · On-site

$99K - $138K/yr

Experience with one or more radiation transport codes, including but not limited to NOVICE, FASTRAD, SHIELDOSE2, GEANT4, or MCNP. * Experience with the use of commercial or automotive parts in a ...

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Geant4 information

What is the difference between Geant4 vs Medical Physicist?

AspectGeant4Medical Physicist
Required CredentialsPhysics or engineering degree, programming skillsPhysics or medical physics degree, certification (e.g., ABR)
Work EnvironmentResearch labs, simulation developmentHospitals, clinics, radiation therapy centers
Industry UsageParticle physics, radiation simulationMedical imaging, radiation therapy, diagnostics

While Geant4 focuses on developing and implementing physics simulations for research, Medical Physicists apply physics principles to diagnose and treat patients using radiation. Both roles require strong physics backgrounds, but their work environments and applications differ significantly.

What are the key skills and qualifications needed to thrive as a Geant4 Simulation Developer, and why are they important?

To thrive as a Geant4 Simulation Developer, you need strong proficiency in C++ programming, a solid background in physics or engineering, and experience with Monte Carlo particle transport simulations. Familiarity with the Geant4 toolkit, scientific computing libraries, and version control systems like Git is typically required, and advanced degrees or certifications in physics or related fields are highly beneficial. Analytical thinking, problem-solving skills, and effective collaboration are essential soft skills for excelling in this role. These competencies are crucial for developing accurate simulations, troubleshooting complex issues, and supporting research or engineering projects in scientific and medical domains.

What are some common challenges faced by Geant4 developers when integrating simulations into larger research projects?

One common challenge Geant4 developers encounter is ensuring seamless integration of complex simulations into multidisciplinary research environments, which often involve collaboration with scientists, engineers, and software teams. This typically requires adapting simulation outputs to match the data formats and analysis workflows of the broader project, as well as maintaining code compatibility with evolving software dependencies. Effective communication and a solid understanding of project requirements are crucial to address these challenges and to contribute meaningful results to the team’s goals.

What is Geant4?

Geant4 is a software toolkit for the simulation of the passage of particles through matter, widely used in high energy physics, nuclear experiments, and medical physics. It allows scientists and engineers to model how particles interact with complex geometries and materials, helping to design detectors and optimize experiments. Written in C++, Geant4 provides a flexible and extensible framework for simulating physics processes such as electromagnetic, hadronic, and optical interactions. The toolkit is developed by an international collaboration and is open-source, making it accessible to researchers around the world.
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What states have the most Geant4 jobs? States with the most job openings for Geant4 jobs include:
What job categories do people searching Geant4 jobs look for? The top searched job categories for Geant4 jobs are:
Geant4 jobs near you
Infographic showing various Geant4 job openings in the United States as of June 2026, with employment types broken down into 94% Full Time, and 6% Contract. Highlights an 88% Physical, 6% Hybrid, and 6% Remote job distribution.

Radiation Engineer II

True Anomaly

Denver, CO • On-site

$95K - $130K/yr

Full-time

Medical, Dental, Vision, Retirement, PTO

Posted 5 days ago

Job description

Space is a warfighting domain. True Anomaly seeks those with the talent and ambition to build the technology that secures it.
OUR MISSION
True Anomaly delivers decisive capabilities for space superiority. We build autonomous spacecraft, advanced payloads, mission software, and space-based interceptors - enabling the U.S. and its Allies to secure the space environment and counter threats from the ultimate high ground.
OUR VALUES
  • Be the offset. We create asymmetric advantages with creativity and ingenuity.
  • What would it take? We challenge assumptions to deliver ambitious results.
  • It's the people. Our team is our competitive advantage and we are better together.

YOUR MISSION
True Anomaly is seeking a skilled Radiation Engineer II to support the radiation analysis, component testing, and mitigation strategy development for our spacecraft electrical systems. You will be a key technical contributor to radiation hardness assurance across our programs - developing environment models, executing test campaigns, and maintaining the parts library that underpins our mission reliability. You bring hands-on experience with radiation test facilities, strong analytical skills, and the ability to communicate radiation and reliability risks clearly to engineers and program stakeholders alike.
RESPONSIBILITIES
  • Develop TID, SEE, and DDD models for any orbital regime using industry-standard tools and best practices
  • Budget, schedule, plan, and execute radiation test campaigns at external facilities (protons, heavy ions, gamma, neutron) or through third-party partners
  • Provide unit and mission-level radiation analyses including SEE rates, availability estimates, lifetime TID and DDD exposures, and associated artifacts for requirements verification
  • Support reliable part selection, circuit design, and passive and active radiation mitigation strategies to increase probability of mission success
  • Maintain and grow the parts library database with critical radiation and reliability information
  • Assist in developing radiation and reliability engineering processes and provide cross-discipline training to instill a culture of survivability awareness
  • Support proposal writing, requirements development, schedule baselines, customer briefings, and design reviews (SRR, PDR, CDR) with credible radiation and reliability analyses
  • Communicate product development status and issues with leadership and stakeholders

QUALIFICATIONS
  • Bachelor's degree in Physics, Electrical Engineering, Nuclear Engineering, or related field
  • 2-4 years of professional experience in space radiation engineering or a related discipline
  • Proficiency with radiation environment modeling tools such as AE9/AP9/SPM, CREME96, OMERE, or SPENVIS
  • Familiarity with radiation test standards including MIL-STD-750, MIL-STD-883, ECSS-Q-ST-60-15C, and NASA testing guidelines
  • Experience planning and executing SEE, TID, and DDD test campaigns
  • Proficiency with data analysis and modeling software (Python, MATLAB, or equivalent)
  • Strong lab experience with oscilloscopes, logic analyzers, source meters, power supplies, and automated data collection
  • Excellent written and verbal communication skills

PREFERRED SKILLS AND EXPERIENCE
  • Master's or Ph.D. in Electrical Engineering, Physics, Reliability Engineering, or related field
  • Familiarity with Radiation Hardness by Design (RHbD) principles
  • Familiarity with radiation transport and shielding analysis tools (NOVICE, FASTRAD, GEANT4)
  • Familiarity with circuit simulation tools such as LTSpice or PSpice
  • Familiarity with space charging effects on materials and electronics
  • Customer-facing experience presenting radiation and reliability assessments at design reviews
  • Experience working in a fast-paced, startup environment or a similarly dynamic setting

COMPENSATION
  • Base Salary: DEN: $90,000 - $125,000 | LB: $95,000 - $130,000
  • Equity + Benefits including Health, Dental, Vision, HRA/HSA options, PTO and paid holidays, 401K, Parental Leave

Your actual level and base salary will be determined on a case-by-case basis and may vary based on the following considerations: job-related knowledge and skills, education, location, and experience.
ADDITIONAL REQUIREMENTS
  • Work Location-Successful candidates will be located near Denver or Long Beach locations. While we observe a hybrid work environment, most work must be done on site.
  • Work environment-the work environment; temperature, noise level, inside or outside, or other factors that will affect the person's working conditions while performing the job.
  • Physical demands-the physical demands of the job, including bending, sitting, lifting and driving.

This position will be open until it is successfully filled. To submit your application, please follow the directions below. #LI-Onsite
To conform to U.S. Government space 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.
True Anomaly is committed to equal employment opportunity on any basis protected by applicable state and federal laws. If you have a disability or additional need that requires accommodation, please do not hesitate to let us.

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